Theophylact of Ohrid

"Eat," He says, "and drink what they have," that is, whatever they set before you, and even if it be little and poor, do not demand more. Accept food in place of a reward, that is, do not seek to receive food and payment separately, but accept the food itself as your reward. See how He makes His disciples firm against poverty.

Commentary on Luke ↗

Bede

Now having described the reception from different houses, he teaches them what they ought to do in the cities; namely, to have intercourse with the good in all, but to keep from the society of the wicked in every thing; as it follows, But into whatsoever city ye enter, and they receive you, eat such things as are set before you.

Catena Aurea by Aquinas ↗

Bonaventure

And into whatever city you enter. After the common instruction of the disciples, the Evangelist here subjoins a special instruction according to the diversities of the hearers. And since some were prepared to receive them, as the faithful, but others to repel them, as the unfaithful, whose guilt increased from contempt of divine grace and disregard of apostolic authority; therefore this part has four sections. …

Commentary on Luke, Chapter 10 ↗