Numbers 20:14

אחיך ישראל THY BROTHER ISRAEL — What reason had he to mention here their brotherhood? But in effect he said to him: We are brothers, sons of Abraham to whom it was said, (Genesis 15:13) “know for a surety that thy seed shall be a stranger [in a land not theirs]”, and upon both of us, being of Abraham’s seed, was the duty of paying that debt (Midrash Tanchuma, Chukat 12). אתה ידעת את כל התלאה THOU KNOWEST ALL THE TRAVAIL — It was on this account that your father separated himself from our father, as it is said, (Genesis 36:6), "And he (Esau) went to another land on account of Jacob, his brother” — on account of the bond which devolved upon both of them, and he cast the whole of it upon Jacob (Genesis Rabbah 82:13; cf. Rashi on Genesis 36.7.2).

וַיִּשְׁלַ֨ח מֹשֶׁ֧ה מַלְאָכִ֛ים מִקָּדֵ֖שׁ אֶל־מֶ֣לֶךְ אֱד֑וֹם כֹּ֤ה אָמַר֙ אָחִ֣יךָ יִשְׂרָאֵ֔ל אַתָּ֣ה יָדַ֔עְתָּ אֵ֥ת כׇּל־הַתְּלָאָ֖ה אֲשֶׁ֥ר מְצָאָֽתְנוּ׃

And Moshe sent messengers from Qadesh to the king of Edom, Thus says thy brother Yisra᾽el, Thou knowst all the travail that has befallen us: