Albert Barnes on John 2:15

A scourge. A whip.

Of small cords. This whip was made as an emblem of authority, and also for the purpose of driving from the temple the cattle which had been brought there for sale. There is no evidence that he used any violence to the men engaged in that unhallowed traffic. The original word implies that these cords were made of twisted rushes or reeds-- probably the ancient material for making ropes.