Numbers 21:21

וישלח ישראל מלאכים AND ISRAEL SENT MESSENGERS — But in another passage it attributes this embassy to Moses, as it is said, (Deuteronomy 2:26), “And ‘I’ sent messengers from the wilderness of Kedemoth [to Sihon king of Heshbon]”! And so, too, it states, (Numbers 20:14), “And Moses sent messengers to the king of Edom”; whilst in the story of Jephtha, it says, (Judges 11:17) “And Israel sent messengers to the king of Edom, etc.”. Each of these pairs of verses is necessary one to the other (i.e., they supplement each other): one keeps back information and the other discloses it, (more lit., one locks up and the other opens) — you may gather from them that Moses is Israel and Israel is Moses, thus telling you that the prince of any generation is the equal of the whole generation, for the prince is the whole (Midrash Tanchuma, Chukat 23).

וַיִּשְׁלַ֤ח יִשְׂרָאֵל֙ מַלְאָכִ֔ים אֶל־סִיחֹ֥ן מֶֽלֶךְ־הָאֱמֹרִ֖י לֵאמֹֽר׃

And Yisra᾽el sent messengers to Siĥon king of the Emori, saying,