Adam Clarke on Hosea 10:5

The inhabitants of Samaria shall fear - According to Calmet, shall worship the calves of Beth-aven; those set up by Jeroboam, at Beth-el. Fear is often taken for religious reverence.

The people thereof shall mourn - On seeing the object of their worship carried into captivity, as well as themselves.

And the priests thereof - כמרים kemarim. The priests of Samaria, says Calmet, are here called kemarim, that is, black coats, or shouters, because they made loud cries in their sacrifices. Instead of יגילו yagilu, "they shall rejoice;" learned men propose ילילו yalilu, "shall howl," which is likely to be the true reading, but it is not supported by any of the MSS. yet discovered. But the exigentia loci, the necessity of the place, requires some such word.