He could not keep the proceeds of his betrayal. He regretted what he had done, and could no longer keep the money.
Sin does not look very far ahead. It does not see what should be obvious. It misreads what gives pleasure to the soul and leaves out of the reckoning a massive factor that ought to be taken into account. When temptation offers us the pleasures of sin, inside the sweetmeat it hides the barbed hook. The sinner sees the one and ignores the other. Is this a good calculation? Like Judas, he does not think so later. The latter end of the matter has more reality to it than the first look towards sin.
In Acts 1:18 Peter says Judas purchased a field with the reward of iniquity – that is, the thirty pieces of silver. He also says that ‘and falling headlong, he burst asunder in the midst, and all his bowels gushed out.’ Are these contradictions? No. Peter is using graphic language in saying that Judas bought it. That was the end result of his action, but others used to the money he had thrown down to actually make the purchase. After his death, what can be said for him? He has purchased a field. He hanged himself and burst asunder. Did he cast himself over a steep place so that he ruptured and died? Did his body remain hung by the neck until it decayed and fell to the ground and burst open? We are not told, but either is possible.