ציטירנדיקער פּירוש אויף תהילים 5:3

[Regarding the word] Attend (Hakshivah) [in the next verse, v. 3]: This root (gizrah - ק-שׁ-ב / Q-Sh-B) is [typically] connected with [the preposition] Lamed [ל־, meaning "to"]. Therefore, it is not correct usage (lo nakhon) to say [a phrase like] "Mi yakshiveni?" ("Who will listen me?" [without the Lamed indicating to whom one listens]).

And the meaning of My King [in v. 3] is: I have no [other] king to whom I cry for help (eshava elav), only You alone.