Bereishis Rabbah 81:3.
Sefaria · Bereishis Rabbah 81:3
הסירו את אלהי הנכר — אלו הצלמים שנטלו משכם.
“Put away the foreign gods” — these are the images that they had taken from Shechem.
The idols that Yaakov ordered removed were the images captured in the sack of Shechem.