Matthew 18:2-6

And he called to him a little child, and set him in the midst of them, and said, Verily I say unto you, Except ye turn, and become as little children, ye shall in no wise enter into the kingdom of heaven. Whosoever therefore shall humble himself as this little child, the same is the greatest in the kingdom of heaven. And whoso shall receive one such little child in my name receiveth me: but whoso shall cause one of these little ones that believe on me to stumble, it is profitable for him that a great millstone should be hanged about his neck, and that he should be sunk in the depth of the sea.