Midrash su Salmi 55:16

17 "And he took." As he took his heart. "It is not an enemy who curses me —I could bear that; it is not my foe who vaunts himself against me —I could hide from him" (Psalms 55:13). This is [referring to] Doeg and Achitofel who were cursing me. They were not my enemies, but they cursed me and did not call me by my name. Rather, "Why did the son of Yishai not come" (I Samuel 20:27); "I have seen the son of Yishai" (I Samuel 22:9); "Behold I have seen a son of Yishai" (I Samuel 16:18). This is, "It is not an enemy who reviles me —I could bear that." "But it is you, my equal, my companion" (Psalms 55:14). As he was a giant in Torah [knowledge]. "And my acquaintance" - as he would give and take in Jewish law (halakha). "Sweet was our fellowship; [we walked in God’s house with feeling]" (Psalms 55:15). What is [the understanding of] "we walked in God’s house with feeling?" As it is taught, "A bull was offered by twenty-four (priests)," so that the feelings could feel [it], as it is stated, "we walked in God’s house with feeling." "Let Him incite death against them" (Psalms 55:16). Rabbi Elazar said, "They had a counsel of heresy within them. To what were they similar. To a house full of straw, but there were holes in the house and the straw went into them. After some days, that straw that was in those holes began to come out [on the house's exterior. Then] everyone knew that the house was of straw. So [with] Doeg and Achitofel, they did not have [performance of] commandments at the beginning. Even though they [later] become masters of Torah, they were like their beginning." This is [the understanding of], "for where they dwell, there evil is." Another interpretation (of Psalms 55:13-16): It is speaking about Moshe. "It is not an enemy" but rather Korach, who is from mine, "who curses me". "Sweet was our fellowship," Aharon and Korach are the same; we walked in God’s house with feeling," this one slaughters and offers and that one sprinkles the blood. "Let Him incite death against them" - who brought death upon himself. "They went down alive into Sheol, with all that belonged to them, etc." (Numbers 16:33).

"agur": "gathered together," as in (Proverbs 30:1) "the words of "agur bin yakeh" (Solomon) the gatherer of wisdom." And (Psalms 55:16) "Let Him incite death against them; let them go down alive into Sheol. For evils are stored up ('b'meguram') in their midst."