II Chronicles 33:14 Midrash

וְאַחֲרֵי־כֵ֡ן בָּנָ֣ה חוֹמָ֣ה חִֽיצוֹנָ֣ה ׀ לְעִיר־דָּוִ֡יד מַעְרָבָה֩ לְגִיח֨וֹן בַּנַּ֜חַל וְלָב֨וֹא בְשַׁ֤עַר הַדָּגִים֙ וְסָבַ֣ב לָעֹ֔פֶל וַיַּגְבִּיהֶ֖הָ מְאֹ֑ד וַיָּ֧שֶׂם שָֽׂרֵי־חַ֛יִל בְּכָל־הֶעָרִ֥ים הַבְּצֻר֖וֹת בִּיהוּדָֽה׃

Now after this he built an outer wall to the city of David, on the west side of Gihon, in the valley, even to the entrance at the fish gate; and he compassed about Ophel, and raised it up a very great height; and he put captains of the army in all the fortified cities of Judah.

Read midrashic interpretation of II Chronicles 33:14: and classical rabbinic exegesis.