Commentary for Avodah Zarah 87:11

The verse from Chronicles has David burning the idols, whereas in Samuel he takes them away. So which is it? The answer is that the verse from Chronicles refers to a period before Ittai the Gittite joined David’s court. Ittai was a gentile and therefore he could annul idols. Before he came they would have had to burn the idols, because Jews cannot annul idols belonging to non-Jews. But after he came, they were able to just carry the idols away because Ittai would annul them.