O Israel, do not thou follow the example of these brutish idolaters, but serve the Lord only. Their help; who trust in God, as he now required. Or their is put for your by a change of persons, which is most frequent in Scripture, and especially in these books.
Related Commentaries of Psalms 115:9
Psalms 115:9
9 O Israel, trust thou in the LORD: he is their help and their shield.