Here, I. The prophet shows them what mischief their sins had done them: They have turned away these things (v. 25), the former and the latter rain, which they used to have in due season (v. 24), but which had of late been withheld (ch. iii. 3), by reason of which the appointed weeks of harvest had sometimes disappointed them. "It is your sin that has withholden good from you, when God was ready to bestow it upon you." Note, It is sin that stops the current of God's favour to us, and deprives us of the blessings we used to receive. It is that which makes the heavens as brass and the earth as iron.