John Calvin on Genesis 19:3

3. 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 thus, indiscriminately, with all. But, when he conceived, from the dignity of their mien and dress, that they were not common men, he baked cakes, and prepared a plentiful feast. Again, Moses says that the angels did eat: not that they had any need to do so; but because the time was not yet come, for the manifestation of their celestial nature.