Context 11:20 for the Lord determined to make them obstinate so they would attack Israel. He wanted Israel to annihilate them without mercy, as he had instructed Moses.1
[11:20]1tnHeb “for from the Lord it was to harden their heart[s] to meet for the battle with Israel, in order to annihilate them, so that they would receive no mercy, in order annihilate them, as the Lord commanded Moses.”