Tosefta על דמאי 3:1

[In the case of] charity collectors (cf. Dem. 3:1), in Shevi'it [the seventh year of the agricultural cycle, when fields lie fallow], they skip (lit., "jump over") the entrances of those who eat Shevi'it-produce, the words of Rabbi Meir. But the Sages say, there is no need to be particular about those who eat Shevi'it-produce, as they even give them bread, and they take it from them, that there is no need to suspect [any] gifts, except for money and eggs. [Even] if there was a city filled with people who ate Shevi'it-produce, there [would be] no need to be particular with those who eat Shevi'it-produce. [However,] the Priests [who] collect in [a state of ritual] cleanliness need to be particular with those who eat Shevi'it-produce.