Jamieson, Fausset and Brown on Hosea 9:15

15. All their wickedness--that is, their chief guilt.

Gilgal--(see on Ho 4:15). This was the scene of their first contumacy in rejecting God and choosing a king (1Sa 11:14, 15; compare 1Sa 8:7), and of their subsequent idolatry.

there I hated them--not with the human passion, but holy hatred of their sin, which required punishment to be inflicted on themselves (compare Mal 1:3).

out of mine house--as in Ho 8:1: out of the land holy unto Me. Or, as "love" is mentioned immediately after, the reference may be to the Hebrew mode of divorce, the husband (God) putting the wife (Israel) out of the house.

princes ... revolters--"Sarim ... Sorerim" (Hebrew), a play on similar sounds.