יְֽרוּשָׁלִַ֗ם הָרִים֮ סָבִ֪יב לָ֥הּ וַ֭יהוָה סָבִ֣יב לְעַמּ֑וֹ מֵ֝עַתָּ֗ה וְעַד־עוֹלָֽם׃
산들이 예루살렘을 두름과 같이 여호와께서 그 백성을 지금부터 영원까지 두르시리로다
Shemot Rabbah
What is “led the people around [vayasev]”? The Holy One blessed be He encompassed them, just as He says: “I will be for it, the utterance of the Lord, a wall of fire around” (Zechariah 2:9) – like a shepherd who was herding his flock and saw wolves coming to attack the flock, and he encircled the flock so they would not be harmed. So too, when Israel departed from Egypt, there were chieftains of Edom, Moav, and Canaan standing and giving counsel [as to] how to come and attack Israel. When the Holy One blessed be He saw that it was so, He encircled [Israel] so they would not come and attack them, as it is stated: “God led the people around [vayasev].” Not only in this world, but so it will be in the World to Come. From where [is this derived?] It is as David says: “Jerusalem, mountains surround it and the Lord surrounds His people” (Psalms 125:2). Alternatively, “God led the people around [vayasev]” – from here our Rabbis said: “Even the poor of Israel may not eat until he reclines [yasev]” (Mishna Pesaḥim 10:1) as that is what the Holy One blessed be He did to them, as it is stated: “God led [the people] around [vayasev].”
Midrash Tehillim
Praise the name of the Lord! Praise Him for the war He fought for us, as it is said, "The Lord will fight for you" (Exodus 14:14). Blessed be the name of the Lord from now and forever. In this world, people may curse God and provoke Him, but in the world to come, it will not be so. God said, "You have blessed Me from now and forever, so too will I do the same" (Psalm 125:2). "The Lord surrounds His people from now until eternity" (ibid.).
Sifrei Devarim
"and it shall consume the land and its produce": Eretz Yisrael. "and it shall set ablaze the foundations of the mountains": Jerusalem, as it is written (Psalms 125:2) "Jerusalem — mountains surround it, and the L-rd surrounds His people."