Hosea 2:15

I will give] The vineyards destroyed by the enemy (Hosea 2:12) would be restored. Achor] i.e. trouble. Achor was the valley where Achan was stoned for his sin (Joshua 7:26). It was on this account called the valley of Achor, or trouble. What is meant by its use here is that, while the Israelites would find that as of old sin would be followed by punishment, the punishment was meant to purify and discipline, and the 'trouble' was thus the 'door of hope.' Though Israel had been again unfaithful, God was still 'plenteous in mercy.' Sing] RV 'make answer,' i.e. listen to the call of God.