Genesis 18:6

Yet he pressed them strongly, so they turned aside to him and entered his house; and he made a feast for them and baked unleavened bread, and they ate.

So Gideon went in and prepared a young goat and unleavened bread from an ephah of flour; he put the meat in a basket and the broth in a pot and brought them out to him under the oak and presented them.

And the woman had a fattened calf in the house, and she quickly sacrificed it; and she took flour, kneaded it, and baked unleavened bread from it.

So Amnon lay down and pretended to be ill; and the king came to see him, and Amnon said to the king, “Please let my sister Tamar come and make me a couple of cakes in my sight, that I may eat from her hand.”

He spoke another parable to them, “The kingdom of heaven is like leaven, which a woman took and hid in three sata of flour until it was all leavened.”

Do not neglect to show hospitality to strangers, for by this some have entertained angels without knowing it.