Tosefta for Bekhorot 32:28
העמיד ולדות תחת אמותיהן ולדי ולדות פטורין
however, said: The offspring of the offspring are also exempt, but the offspring of the offspring of the offspring are liable [to t law of the firstling].
Tosefta Demai
A Jewish Priest [can] eat with a Samaritan Priest when [the food is] made in [a state of] impurity, but when [it is] made in [a state of] purity, behold, he does not eat it with him, because he feeds him the meat of an unblemished first-born [calf], and has him drink wine from a [ritually] pure fourth[-year vineyard].*See Deut. 15:22 and Lev. 19:24, and discussions at Bekh. 5:2 (also Bekh. 32b:10) re: first-born calf, and Ter. 3:9 and Y. Peah VII.5.2 re: fourth-year vineyard.
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