Matthew 18:1-5

1At that time the disciples came to Jesus and asked, "Who is the greatest in the kingdom of heaven?"
2He called a little child and had him stand among them. 3And he said: "I tell you the truth, unless you change and become like little children, you will never enter the kingdom of heaven. 4Therefore, whoever humbles himself like this child is the greatest in the kingdom of heaven.

5"And whoever welcomes a little child like this in my name welcomes me. 6But if anyone causes one of these little ones who believe in me to sin, it would be better for him to have a large millstone hung around his neck and to be drowned in the depths of the sea.