Matthew 12:31 - Therefore I tell you, every sin and blasphemy will be forgiven men, but the blasphemy against the Spirit will not be forgiven men.
Psalms 95:10 - Forty long years I was grieved with that generation, and said, "It is a people that errs in their heart. They have not known my ways."
Exodus 34:7 - keeping loving kindness for thousands, forgiving iniquity and disobedience and sin; and that will by no means clear the guilty, visiting the iniquity of the fathers on the children, and on the children's children, on the third and on the fourth generation."
James 4:17 - To him therefore who knows to do good, and doesn't do it, to him it is sin.
Romans 5:12 - 21 - Therefore as sin entered into the world through one man, and death through sin; and so death passed to all men, because all sinned. For until the law, sin was in the world; but sin is not charged when there is no law. Nevertheless death reigned from Adam until Moses, even over those whose sins weren't like Adam's disobedience, who is a foreshadowing of him who was to come. But the free gift isn't like the trespass. For if by the trespass of the one the many died, much more did the grace of God, and the gift by the grace of the one man, Jesus Christ, abound to the many. The gift is not as through one who sinned: for the judgment came by one to condemnation, but the free gift came of many trespasses to justification. For if by the trespass of the one, death reigned through the one; so much more will those who receive the abundance of grace and of the gift of righteousness reign in life through the one, Jesus Christ. So then as through one trespass, all men were condemned; even so through one act of righteousness, all men were justified to life. For as through the one man's disobedience many were made sinners, even so through the obedience of the one, many will be made righteous. The law came in besides, that the trespass might abound; but where sin abounded, grace abounded more exceedingly; that as sin reigned in death, even so grace might reign through righteousness to eternal life through Jesus Christ our Lord.