פירוש על שמואל ב 3:27

Within the gate. [Yoav brought Avner] before a sanhedrin to be judged¹⁶The word שַׁעַר often refers to judges who usually hold court at the gate of the city, cf. Devorim 22,15. for the [spilling of] blood of his brother, Asoel.

Deceptively. In a mistake provoking [way] so that Avner would not realize that it is in [Yoav's] heart to kill him. Cut up the verse [to rearrange it's words as follows] "and Yoav steered him deceptively to go within the gate to talk to him."