Psalms 51:5
“5 Behold, I was shaped in iniquity; and in sin did my mother conceive me. (Unequivocally, this Verse proclaims the fact of original sin. This Passage states that all are born in sin, and as a result of Adam’s Fall in the Garden of Eden.
When Adam, as the federal head of the human race, failed, this means that all of humanity failed. It means that all who would be born would, in effect, be born lost.
As a result of this, the Second Man, the Last Adam, the Lord Jesus Christ, had to come into this world, in effect, God becoming Man, to undo what the original Adam did. He would have to keep the Law of God perfectly, which He did, all as our Substitute, and then pay the penalty for the terrible sin debt owed by all of mankind, for all had broken the Law, which He did by giving Himself on the Cross of Calvary [Jn. 3:16].
To escape the judgment of original sin, man must be “born again,” which is carried out by the believing sinner expressing Faith in Christ and what Christ did at the Cross [Jn. 3:3; Eph. 2:8–9].)”
JSM