Matthew 18:3 in the King James Version
And said, Verily I say unto you, Except ye be converted, and become as little children, ye shall not enter into the kingdom of heaven.
Context
2 Jesus called a little child to himself, and set him in the middle of them
3 and said, “Most certainly I tell you, unless you turn and become as little children, you will in no way enter into the Kingdom of Heaven.
4 Whoever therefore humbles himself as this little child is the greatest in the Kingdom of Heaven.