'Little Ones' in the Bible

and whoever may give to drink to one of these little ones a cup of cold water only in the name of a disciple, verily I say to you, he may not lose his reward.'

and whoever may cause to stumble one of those little ones who are believing in me, it is better for him that a weighty millstone may be hanged upon his neck, and he may be sunk in the depth of the sea.

Beware! -- ye may not despise one of these little ones, for I say to you, that their messengers in the heavens do always behold the face of my Father who is in the heavens,

so it is not will in presence of your Father who is in the heavens, that one of these little ones may perish.