Parashas Shemos
וַיֹּ֥אמֶר אֶל־בְּנֹתָ֖יו וְאַיּ֑וֹ לָ֤מָּה זֶּה֙ עֲזַבְתֶּ֣ן אֶת־הָאִ֔ישׁ קִרְאֶ֥ן ל֖וֹ וְיֹ֥אכַל לָֽחֶם׃
He said to his daughters, “Where is he then? Why did you leave the man? Ask him in to break bread.”
Torah Temimah points to R’ Yochanan — Sanhedrin / TT (verified).
ויאכל לחם — א״ר יוחנן: גדולה לגימא שמקרבת את הרחוקים\ldots בשכר קראן לו ויאכל לחם זכו בני בניו וישבו בלשכת הגזית.
English: “That he may eat bread” — R’ Yochanan said: Great is a morsel, for it draws near those who are far\ldots In the merit of “Call him that he may eat bread,” his descendants merited to sit in the Chamber of Hewn Stone.
Custom
Chazal teach that hospitality shown to Moshe already secured for Yisro’s line a place in the Sanhedrin.