“all those who entered the gate of his city.” This idiomatic expression means more than, “those who go in and out of the city,” it refers to the “elders at the gate,” the important people and decision-makers in the city. Obviously, the whole city was not present for the negotiations between Abraham and Ephron, but the important people of the city were all there. The gate of the city was not just a door, it was a “gate area,” usually with an inner and outer gate, and places for sitting inside the gate area.