Adam Clarke on Joel 1:8

I will sell your sons - When Alexander took Tyre, he reduced into slavery all the lower people, and the women. Arrian, lib. ii., says that thirty thousand of them were sold. Artaxerxes Ochus destroyed Sidon, and subdued the other cities of Phoenicia. In all these wars, says Calmet, the Jews, who obeyed the Persians, did not neglect to purchase Phoenician slaves, whom they sold again to the Sabeans, or Arabs.