What did the early Church believe about praying to saints ( asking their intercession) It was the accepted practice and the Christians inherited the basic theology from later Judaism. Naturally they applies it to their own practice. Below are "quotes" from early Church documents addressing the intercession of the saints. Please note the dates written.
As the following passages show, the early Church Fathers not only clearly recognized the biblical teaching that those in heaven can and do intercede for us, but they also applied this teaching in their own daily prayer life.
Hermas
"[The Shepherd said:] ‘But those who are weak and slothful in prayer, hesitate to ask anything from the Lord; but the Lord is full of compassion, and gives without fail to all who ask him. But you, [Hermas,] having been strengthened by the holy angel [you saw], and having obtained from him such intercession, and not being slothful, why do not you ask of the Lord understanding, and receive it from him?’" (The Shepherd 3:5:4 [A.D. 80]).
Clement of Alexandria
"In this way is he [the true Christian] always pure for prayer. He also prays in the society of angels, as being already of angelic rank, and he is never out of their holy keeping; and though he pray alone, he has the choir of the saints standing with him [in prayer]" (Miscellanies 7:12 [A.D. 208]).
Origen
"But not the high priest [Christ] alone prays for those who pray sincerely, but also the angels . . . as also the souls of the saints who have already fallen asleep" (Prayer 11 [A.D. 233]).
Cyprian of Carthage
"Let us remember one another in concord and unanimity. Let us on both sides [of death] always pray for one another. Let us relieve burdens and afflictions by mutual love, that if one of us, by the swiftness of divine condescension, shall go hence first, our love may continue in the presence of the Lord, and our prayers for our brethren and sisters not cease in the presence of the Father’s mercy" (Letters 56[60]:5 [A.D. 253]).
Anonymous
"Atticus, sleep in peace, secure in your safety, and pray anxiously for our sins" (funerary inscription near St. Sabina’s in Rome [A.D. 300]).
"Pray for your parents, Matronata Matrona. She lived one year, fifty-two days" (ibid.).
"Mother of God,
[listen to] my petitions; do not disregard us in adversity, but rescue us from danger" (Rylands Papyrus 3 [A.D. 350]).
Methodius
"Hail to you for ever, Virgin Mother of God, our unceasing joy, for to you do I turn again. You are the beginning of our feast; you are its middle and end; the pearl of great price that belongs to the kingdom; the fat of every victim, the living altar of the Bread of Life [Jesus]. Hail, you treasure of the love of God. Hail, you fount of the Son’s love for man. . . . You gleamed, sweet gift-bestowing Mother, with the light of the sun; you gleamed with the insupportable fires of a most fervent charity, bringing forth in the end that which was conceived of you . . . making manifest the mystery hidden and unspeakable, the invisible Son of the Father—the Prince of Peace, who in a marvelous manner showed himself as less than all littleness" (Oration on Simeon and Anna 14 [A.D. 305]).
"Therefore, we pray [ask] you, the most excellent among women, who glories in the confidence of your maternal honors, that you would unceasingly keep us in remembrance. O holy Mother of God, remember us, I say, who make our boast in you, and who in august hymns celebrate the memory, which will ever live, and never fade away" (ibid.).
"And you also, O honored and venerable Simeon, you earliest host of our holy religion, and teacher of the resurrection of the faithful, do be our patron and advocate with that Savior God, whom you were deemed worthy to receive into your arms. We, together with you, sing our praises to Christ, who has the power of life and death, saying, ‘You are the true Light, proceeding from the true Light; the true God, begotten of the true God’" (ibid.).
As the following passages show, the early Church Fathers not only clearly recognized the biblical teaching that those in heaven can and do intercede for us, but they also applied this teaching in their own daily prayer life.
Hermas
"[The Shepherd said:] ‘But those who are weak and slothful in prayer, hesitate to ask anything from the Lord; but the Lord is full of compassion, and gives without fail to all who ask him. But you, [Hermas,] having been strengthened by the holy angel [you saw], and having obtained from him such intercession, and not being slothful, why do not you ask of the Lord understanding, and receive it from him?’" (The Shepherd 3:5:4 [A.D. 80]).
Clement of Alexandria
"In this way is he [the true Christian] always pure for prayer. He also prays in the society of angels, as being already of angelic rank, and he is never out of their holy keeping; and though he pray alone, he has the choir of the saints standing with him [in prayer]" (Miscellanies 7:12 [A.D. 208]).
Origen
"But not the high priest [Christ] alone prays for those who pray sincerely, but also the angels . . . as also the souls of the saints who have already fallen asleep" (Prayer 11 [A.D. 233]).
Cyprian of Carthage
"Let us remember one another in concord and unanimity. Let us on both sides [of death] always pray for one another. Let us relieve burdens and afflictions by mutual love, that if one of us, by the swiftness of divine condescension, shall go hence first, our love may continue in the presence of the Lord, and our prayers for our brethren and sisters not cease in the presence of the Father’s mercy" (Letters 56[60]:5 [A.D. 253]).
Anonymous
"Atticus, sleep in peace, secure in your safety, and pray anxiously for our sins" (funerary inscription near St. Sabina’s in Rome [A.D. 300]).
"Pray for your parents, Matronata Matrona. She lived one year, fifty-two days" (ibid.).
"Mother of God,
[listen to] my petitions; do not disregard us in adversity, but rescue us from danger" (Rylands Papyrus 3 [A.D. 350]).
Methodius
"Hail to you for ever, Virgin Mother of God, our unceasing joy, for to you do I turn again. You are the beginning of our feast; you are its middle and end; the pearl of great price that belongs to the kingdom; the fat of every victim, the living altar of the Bread of Life [Jesus]. Hail, you treasure of the love of God. Hail, you fount of the Son’s love for man. . . . You gleamed, sweet gift-bestowing Mother, with the light of the sun; you gleamed with the insupportable fires of a most fervent charity, bringing forth in the end that which was conceived of you . . . making manifest the mystery hidden and unspeakable, the invisible Son of the Father—the Prince of Peace, who in a marvelous manner showed himself as less than all littleness" (Oration on Simeon and Anna 14 [A.D. 305]).
"Therefore, we pray [ask] you, the most excellent among women, who glories in the confidence of your maternal honors, that you would unceasingly keep us in remembrance. O holy Mother of God, remember us, I say, who make our boast in you, and who in august hymns celebrate the memory, which will ever live, and never fade away" (ibid.).
"And you also, O honored and venerable Simeon, you earliest host of our holy religion, and teacher of the resurrection of the faithful, do be our patron and advocate with that Savior God, whom you were deemed worthy to receive into your arms. We, together with you, sing our praises to Christ, who has the power of life and death, saying, ‘You are the true Light, proceeding from the true Light; the true God, begotten of the true God’" (ibid.).