Who better to get an example from than our Savior; (also all verses are not about prayer, but I think a right mindset helps!)
Matt 6:1-14, "And when you pray, you must not be like the hypocrites. For they love to pray standing in the synagogues and in the corners of the streets, so they may be seen by men. Truly I say to you; They have their reward.
But you, when you pray, go into the secret place, and when you have shut the door, pray to your Father Who is in secret; and your Father, Who sees in secret, will reward you openly. And when you pray, do not use mindless repetitions as the heathen do. For they think that they will be heard only because they speak so much. Therefore, do not be like them; for your Father knows what things you have need of, before you ask Him. After this manner, you should pray: Our Father Who is in heaven, hallowed is Your Name. Your Kingdom come. Your will be done in earth, as it is in heaven. Give us this day our daily bread. And forgive us of our debts, as we forgive our debtors. And do not allow us to be led into temptation, but deliver us from evil. For Yours is the Kingdom, and the Power, and the Glory forever, so be it.
For if you forgive men their trespasses, your Heavenly Father will also forgive you; But if you do not forgive men their trespasses, neither will your Father forgive your trespasses."
Mattithyah 6:19, "Do not store up treasures for yourselves upon earth, where moth and rust consume, and where thieves break in and steal. But store up for yourselves treasures in heaven, where neither moth nor rust consumes, and where thieves do not break in and steal; For where your treasure is, there your heart will be also."
Matt 7:7-12, "Ask, and it will be given to you; seek, and you will find; knock, and it will be opened to you: For everyone who asks, receives; and he who seeks, finds; and to him who knocks, it will be opened. For what man is there among you who, if his son asks for bread, would give him a stone? Or if he asks for a fish, would give him a serpent? If you then, being sinful, know how to give righteous gifts to your children, how much more will your Father Who is in heaven give righteous gifts to those who ask Him? Therefore, all things you want men to do to you, do the same to them, for this is (the teaching of) the Law and the Prophets."
Matt 6:22-23, "The lamp of the body is the eye. Therefore, if your eye is righteous, your whole body will be full of light. But if your eye is wicked, your whole body will be full of darkness. If, then, the light within you is darkness, how great that darkness is!"
Isayah 59:1-3, "Behold, Yahweh's hand is not shortened, that it cannot save; nor His ear heavy, that it cannot hear. But your own iniquities have separated you from your Father; and your own sins have caused Him to hide His face from you, so He will not listen. For your hands are defiled with blood, and your fingers with iniquity; sin. Your lips have spoken lies, your tongue has muttered perverseness."
Proverbs 15:29, "Yahweh is far from the wicked, but He hears the prayer of the righteous."
1 Kepha (Peter) 3:12, "For the eyes of Yahweh are on the righteous, and His ears are open to their prayers; but the face of Yahweh is against those who do evil."
Lamentation 3:41, "Let us lift our hearts along with our hands to Yahweh in heaven."
Psalm 141:2, "May our prayers be set before You like incense. May the lifting up of our hands be like the evening sacrifice."
Psalm 134:1-3, "Behold, bless Yahweh, all you servants of Yahweh, who stand by night in The House of Yahweh! Raise your hands in the sanctuary, and bless Yahweh! May Yahweh, Who made heaven and earth, bless you out of Zion!