Why does Idek have Eliezar whipped?

Eliezer goes exploring and discovers why Idek didn’t want anyone in the camp: he’s sleeping with this young Polish girl. Eliezer laughs, thinking about the absurdity of moving 100 prisoners to the warehouse just so he can get laid.

Idek discovers Eliezer and gets angry. He gives Eliezer 25 lashes with the whip in front of the whole block and tells him he’ll get five times that if he tells anyone what he saw.