תניא: המודר הנאה מחבירו אין מתירין לו אלא בפניו. מנא הני מילי? אמר רב נחמן: דכתיב: ״ויאמר ה׳ אל משה במדין לך שב מצרים כי מתו כל האנשים״. אמר לו: במדין נדרת — לך והתר נדרך במדין. דכתיב: ״ויואל משה״ — אין אלה אלא שבועה, דכתיב: ״ויבא אתו באלה״.
§ It is taught in a baraita (Tosefta 2:12): With regard to one prohibited by a vow from deriving benefit from another, they dissolve the vow for him only in the presence of the one who is the subject of the vow. The Talmud asks: From where are these matters derived? Rav Naḥman said: As it is written: “And YHWH said to Moses in Midian: Go, return to Egypt; for all the men are dead” (Exodus 4:19). Rav Naḥman notes that the verse specifies where God spoke to Moses, and explains that God said to him: In Midian you vowed to Yitro that you would not return to Egypt, go and dissolve your vow in Midian. And where does it say that Moses vowed to Yitro? For it is written: “And Moses was content [vayo’el] to reside with the man” (Exodus 2:21). The word vayo’el is related to the word ala, and ala means nothing other than an oath, as it is written: “And he…brought him under an oath [ala]” (Ezekiel 17:13), and the halakhot of dissolution of oaths are identical to those of dissolution of vows.