John Calvin Commentary Genesis 19:3

"And he urged them greatly; and they turned in unto him, and entered into his house; and he made them a feast, and did bake unleavened bread, and they did eat." — Genesis 19:3 (ASV)

And he made them a feast. By these words, and others following, Moses shows that the angels were more sumptuously entertained than was customary: for Lot did not act in this way, indiscriminately, with everyone. But, when he perceived from the dignity of their demeanor and dress, that they were not common men, he baked cakes and prepared a plentiful feast. Again, Moses says that the angels ate: not that they had any need to do so; but because the time had not yet come for the manifestation of their celestial nature.