v1-3: Israel rejoices in her feasts, celebrating wealth and prosperity, but neglecting God. Although there is rejoicing today, tomorrow brings famine and exile.
v4-6: Isaiah criticised the empty ritual of Judah, but here even the comfort of familiar things, sacrifices and feast days, is removed. Whilst ritual can be an enemy of truth, it can also be a reminder of truth; and Israel was to lose even that.
The reference here seems to be to the Feast Of Tabernacles, when the harvest had been gathered in, the beginning of the eternal kingdom, new heavens and new earth.
v7-8: The days of punishment arrive; Israel begins to reap what she sowed (8.7). The godly man is considered insane, the prophet a fool, as the vast majority rejected the ways of the Lord. Hosea is expecting to be respected, hsi message accepted. How wrong he was! It is one thing to be rejected by the pagans, but quite another to be rejected by 'the people of God.'
v9: Reminders from the past (1), Gibeah, Judg 19; the desperate corruption of earlier times; every man did what was right in his own eyes; the people had fallen from the good times under Joshua, and lived in decadence and anarchy. God sent judgments as the people were repeatedly attacked by surrounding nations, and became subject to foreign powers.
v10: Reminders from the past (2), Baal-Peor, Num 25; Ps 116.8. Israel made a promising start, like grapes in the wilderness, the first figs on a fig-tree, promising more fruit to follow. But they loved an idol, and became like the idol; what we worship governs our behaviour.
v11-14: Glory flying away; fruitlessness, children lost; they will diminish, but not increase, Deut 28.38-42.
v15-16: Reminders from the past (3), 1 Sam 11. At Gilgal, the people desired a king, and rejected the Lord; setting in train the monarchy of Israel. At times this was godly, under David and Solomon; at times it was influential, under Omri and Ahab; but for Israel, this was the route into much wickedness.
v17: Summary of the chapter; the people will be cast away because of their disobedience; real and severe consequences happened before, and would happen again.