Deuteronomy 6: 5-9
Love the LORD your God with all your heart and with all your soul and with all your strength. 6 These commandments that I give you today are to be on your hearts. 7 Impress them on your children. Talk about them when you sit at home and when you walk along the road, when you lie down and when you get up. 8 Tie them as symbols on your hands and bind them on your foreheads. 9 Write them on the doorframes of your houses and on your gates.
Proverbs 22:6
Start children off on the way they should go, and even when they are old they will not turn from it.
Matthew 19:14
Jesus said, “Let the little children come to me, and do not hinder them, for the kingdom of heaven belongs to such as these.”