Midrash sobre II Samuel 5:8

Rabbi Simeon said: Abraham spake to Isaac his son (saying), This servant is suspected of all the transgressions of the Torah, and deceit is in this servant, as it is said, "He is a Canaanite, the balances of deceit are in his hand; he loveth to defraud" (Hos. 12:7). See, lest he has defiled her, therefore bring the girl into the tent and examine her tactually; || and if she be undefiled, behold, she is destined for thee from her mother's womb. He brought her into the tent and examined her tactually, and he showed the result to Abraham his father, and afterwards he took her to be his wife, as it is said, "And Isaac brought her into the tent of Sarah his mother… And Isaac was comforted after his mother's death" (Gen. 24:67); for the deeds of Rebecca were like unto those of Sarah. Hence the Israelites have the custom of producing the tokens of the damsel's virginity, as it is said, "Then shall the father of the damsel, and her mother, take and bring forth the tokens of the damsel's virginity" (Deut. 22:15).

“For by You I run upon a troop...” (Tehillim 18:30) R’ Chiyah said in the name of R’ Levi: when David went to wage war against the Jebusites, he began by saying “Whoever smites the Jebusites and reaches the tower…” (Shmuel II 5:8) and in another verse he says “Whoever smites the Jebusites first will be a chief (l’rosh) and an officer…” (Divre HaYamim I 11:6) So what did Yoav do? He brought a fresh cypress tree (brosh) and fixed it next to the wall of the city. He bent back the flexible head of the cypress, climbed up on to David’s head, grabbed on to the top of the tree and swung onto the top of the wall. David said “May a righteous man strike me with kindness and reprove me (yochicheni rosh)…” (Tehillim 141:5) What did the Holy One do? He lowered the wall and David went up after Yoav, as it says “…and by my God I scale a wall.” (Tehillim 18:30)

JACOB AND LABAN
"WHEN thou goest, thy steps shall not be straitened; and if thou runnest, || thou shalt not stumble" (Prov. 4:12).

(Although) the Israelites were like the sand of the sea, yet it was owing to the force of the sign of the covenant of Abraham's oath. David saw (this) and turned backwards, as it is said, "And David dwelt in the stronghold" (2 Sam. 5:9). They said to him: Thou wilt not be able to enter the city of the Jebusites until thou hast removed all those images upon which the sign of the covenant of Abraham's oath is written, as it is said, "Except thou take away the blind and the lame" (2 Sam. 5:6). "The lame" refers to the images, as it is said, "Wherefore they say, The blind and the lame shall not come into the house" (2 Sam. 5:8). Lest thou shouldst say, The blind and the lame did not enter the Sanctuary, Heaven forbid (that we should say this), but these "blind and lame" refer to the images which have eyes and see not, feet and they walk not, (as it is said), "That are hated of David's soul" (ibid.). Because David hated to hear of and to see idolatry, as it is said, "Wherefore they say, The blind and the lame shall not come into the house" (ibid.).