For the source text click/tap here: Bava Metzia 39
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The Gemara relates: Mari bar Isak, who was a wealthy and powerful man, had a brotherwhom he did not previously know, come to him from Bei Ḥozai, which was distant from central Babylonia. His brother said to him: Divide the property that you inherited from our father and give half to me, as I am your brother. Mari said to him: I do not know who you are.
The case came before Rav Ḥisda. He said to the brother: Mari bar Isak spoke well to you, as it is stated: “And Joseph knew his brothers and they knew him not” (Genesis 42:8)
This teaches that Joseph left Eretz Yisrael without the trace of a beard, and he came with the trace of a beard. This proves that it is possible for brothers not to recognize each other. Mari bar Isak may be telling the truth when he claims he does not recognize you.
We explore the episode of reconciliation of Yosef and his brothers and what we may learn.