A morsel of bread— He promises little, and performs much; a true model of liberality. Under bread is comprehended here, as in many other places, food or eatables in general. For therefore are you come, i.e.. for the purpose of hospitable refreshment. See ch. Genesis 19:8. where the same phrase is used, and implies, "for the purpose of hospitable entertainment and security."
Related Commentaries of Genesis 18:5
Genesis 18:5
5 And I will fetch a morsel of bread, and comfort ye your hearts; after that ye shall pass on: for therefore are ye come to your servant. And they said, So do, as thou hast said.