9:7 Israel was to know that the days of her punishment and retribution were imminent because the nation's iniquity was fat and its hostility to the Lord was great. Another reason for her judgment was that the Israelites had regarded the prophets whom the Lord had sent to them as demented fools (cf. 2 Kings 9:11; Jer. 29:26-27). This probably included Hosea.
9:8 Ephraim tried to function as a prophet of God warning others of approaching danger. But Ephraim had tried to snare the prophets God had sent the people like a hunter catches birds in a net. Thus there was nothing but hostility in the land of Israel between the Ephraimites and the true prophets of Yahweh. Ephraim saw nothing as a prophet and criticized the prophets for preaching what they saw, namely, coming judgment.
9:9 The Israelites had delved deep into depravity, as when the men of Gibeah raped and murdered the visiting Levite's concubine (Judg. 19). This was another occasion in which the Israelites punished one of their own rather than protecting her. The Lord would remember their iniquities and punish their sins. This sin had resulted in war in Israel and almost the obliteration of the tribe of Benjamin (Judg. 20). War would come again, and God would almost entirely obliterate all the Israelites for their sins.