Related על דמאי 7:3

A worker that was working at the place of a homeowner and [the worker] does not trust [the homeowner] as to tithes, Rabbi Yosei says, [this is the subject of] a ruling of the bet din, that he should take the priestly portion of the first tithe from [the portion of the produce] belonging to the homeowner, and the priestly portion of the second tithe from [the portion of the produce] belonging to the worker.