Reference for Chullin 262:8

מאי טעמא

'And it is exacted even from the poorest in Israel' - for R'Ila'a said: An inference is to be made by means of the common expression 'for the stranger' from the other [dues to the poor]:<span class="x" onmousemove="('comment',' Cf. Lev. XXIII, 22, and Deut. ibid.');">⁷</span>

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