Deuteronomy 2:26

ממדבר קדמות [AND I SENT MESSENGERS] FROM THE WILDERNESS OF KEDEMOTH — Although the Omnipresent had not commanded me to proclaim peace unto Sihon I learnt to do so from what happened in the wilderness of Sinai, i.e. from an incident that relates to the Torah which pre-existed (קדמה) the world. For when the Holy One, blessed be He, was about to give it (the Torah) to Israel, he took it round to Esau and Ishmael. It was manifest before Him that they would not accept it, but yet He opened unto them with peace. Similarly I first approached Sihon with words of peace. — Another explanation of ממדבר קדמות: Moses said to God, "I learnt this from what Thou didst say in the wilderness — from Thee Who wast in existence before (קדמת) the world. Thou couldst have sent one flash of lightning to bum up the Egyptians, but Thou didst send me from the wilderness to Pharaoh, to say gently, (Exodus 5:1) "Let my people go” (Yalkut Shimoni on Torah 764:27).

וָאֶשְׁלַ֤ח מַלְאָכִים֙ מִמִּדְבַּ֣ר קְדֵמ֔וֹת אֶל־סִיח֖וֹן מֶ֣לֶךְ חֶשְׁבּ֑וֹן דִּבְרֵ֥י שָׁל֖וֹם לֵאמֹֽר׃

And I sent messengers out of the wilderness of Qedemot to Siĥon king of Ḥeshbon with words of peace, saying,