أَدْخَلَ كُلُّ مِنْهُمْ يَدَهُ فِي جَيْبِهِ
Each person in the gathering put a hand into a pocket.
The forceful sermon now elicits a visible response. The audience does not merely praise the speech; its members make a concrete gesture of giving.
Kullu minhum stresses the group, while the hand entering a pocket offers a close-up detail. The action shows the speaker's apparent effect on his listeners, but does not by itself establish their inner motives.