Deuteronomy 1:4

אחרי הכתו AFTER HE HAD SMITTEN [SIHON] — Moses said: If I reprove them before they enter at least a part of the land, they will say, “What claim has this man upon us? What good has he ever conferred upon us? He only comes (his purpose is only) to vex us and to discover some pretext for leaving us in the wilderness, for he really has not the power to bring us into the land” On this account he waited until he had defeated Sihon and Og before them and had given them possession of their land — and only after that did he reprove them (Sifrei Devarim 3:2). סיחן … אשר יושב בחשבון [AFTER HE HAD SMITTEN] SIHON … WHO DWELT IN HESHBON — Even if Sihon himself had not been difficult to defeat, but had resided at Heshbon, he would have been difficult to defeat, because the city was a difficult one to capture: and if it had been a matter of some other city, but Sihon had resided in it, it would have been difficult to capture, because its king, at least, would have been difficult to defeat. How much more was this so now when the king was difficult to defeat and the land difficult to capture (Sifrei Devarim 3:3; cf. Rashi on Numbers 21:23). אשר יושב בעשתרת [AND OG] WHO DWELT AT ASHTAROTH — here, too, the king was difficult to defeat and the city difficult to capture (Sifrei Devarim 3:4). עשתרת — This is an expression denoting rocks and anything hard, just as (Genesis 14:5) “Ashtaroth Karnaim”, (i.e. the hard rocks of Karnaim) (Sifrei Devarim 3:5)). And indeed this Ashtaroth is identical with Ashtaroth Karnaim where the Rephaim (the giants) were, whom Amraphel smote, as it is said, (Genesis 14:5) “And they smote the Rephaim in Ashtaroth Karnaim". Og, alone, escaped of them, and that is the meaning of what is stated, (Genesis 14:13; cf. Rashi) "And the one who escaped (הפליט) came", for it further states, (Deuteronomy 3:11) "For only Og, king of Bashan, remained of the remnant of the Rephaim", באדרעי IN EDREI — the name of the royal city.

after he had slain Siĥon the king of the Emori, who dwelt in Ḥeshbon, and ῾Og the king of Bashan, who dwelt at ῾Ashtarot in Edre῾i:

אַחֲרֵ֣י הַכֹּת֗וֹ אֵ֚ת סִיחֹן֙ מֶ֣לֶךְ הָֽאֱמֹרִ֔י אֲשֶׁ֥ר יוֹשֵׁ֖ב בְּחֶשְׁבּ֑וֹן וְאֵ֗ת ע֚וֹג מֶ֣לֶךְ הַבָּשָׁ֔ן אֲשֶׁר־יוֹשֵׁ֥ב בְּעַשְׁתָּרֹ֖ת בְּאֶדְרֶֽעִי׃