Daniel 11:28

‘Then he will return to his own land with great substance, and his heart will be against the holy covenant. And he will do his pleasure and return to his own land.'

His mission to Egypt having been mainly successful he returned to his own land loaded with treasures. But news had reached Israel that Antiochus had been killed in Egypt, and Jason, deciding that it was a good time to regain the high priesthood, entered Jerusalem, killing many of his fellow Israelites without mercy. However his attempt was unsuccessful and he had to flee into exile.

Meanwhile Antiochus had heard of these events and decided to teach Israel a lesson. He took Jerusalem by force of arms and slaughtered many (1Ma 1:20-28; 2Ma 5:11-12). Then guided by Menelaus he entered the temple itself (‘against the holy covenant') and looted it (‘he did his own pleasure'). From now on he was a man marked by God.