John Wesley on Hosea 1:4

The blood - The slaughters made by Jehu's hand or by his order, in Jezreel. The house of Jehu - Which had now possessed the throne, through the reigns of Jehoahaz, Jehoash, and Jeroboam; but the usurper, and his successors adhering to the idolatry of Jeroboam the son of Nebat, and adding other sins to it, had now provoked God to declare a sudden extirpation of the family: all this came to pass when Shallum conspiring against Zechariah, slew him, 2Kings 15:8 - 10. The kingdom - After one and forty years tottering it fell to utter ruin and hath so continued to this day.