Kommentar zu Schemuel II 5:6

To the Yevusi. The fortress of Tzion was called Yevus. [Its inhabitants] were from the descendants of Avimelech. They had two idols, one [depicting] a blind person and one [depicting] a lame person. They were made to represent Yitzhok and Yakov.¹Yitzchak was blind at the end of his life (Bereshis, 27,1). Yakov was lamed during the course of his struggle with the angel (Bereishis 32,33). [Placed] in their mouths was the oath Avrohom swore to Avimelech,²Bereishis 21,23–24. This is why they were not displaced [from Tzion]. When Yerushalayim was conquored The tribe of Yehuda did not conquor the fortress [of Tzion], as the verse states, (Yehoshua, 15, 63). "However the Yevusim who lived in Yerushalyim, the descendants of Yehudah were unable to expel them. [About this verse] it is learned: Rebbe Yohoshua, the son of Levi said, They had the ability to [expel the Yevusim] but they were not permitted to.³Because of Avrohom’s oath to Avimelech. This point is made in the Sifri, Re’ey, Piska 72. However, there it’s brought in the name of Rebbe Yehoshua, the son of Korcho.

And the king and his men went to Jerusalem – In Divre HaYamim it says “And David and all of Israel went to Jerusalem…” (Divre HaYamim I 11:4) because now all of Israel were his men. Since he was now king over all of Israel he went to Jerusalem to conquer the citadel of Zion because they had a tradition that Zion was the head of kingship in Israel and only one who was king over all of Israel would conquer. Unto this day there had not been full kingship in Israel because Shaul’s kingship was not permanently established.

And he said to Dovid. Whoever said it,⁴The speaker is unidentified, but is obviously one of the Yevusim.