against the holy covenant - On his way back to Syria, he attacked Jerusalem, the metropolis of Jehovah’s covenant-people, slew eighty thousand, took forty thousand prisoners, and sold forty thousand as slaves (2 Maccabees 5:5-14).
he shall do exploits - He shall effect his purpose. Guided by Menelaus, the high priest, he entered the sanctuary with blasphemies, took away the gold and silver vessels, sacrificed swine on the altar, and sprinkled broth of the flesh through the temple (2 Maccabees 5:15-21).