2:17 The porch - That stately porch built by Solomon, 1Kings 6:3. The altar - The altar of burnt - offering, which stood at some distance from this porch, and here are the priests commanded to stand, fasting and praying, whence they might be heard and seen by the people in the next court, in which the people were wont to pray. To reproach - Famine, though by locusts is a reproach to this thine heritage; it will be greater reproach to be slaves to the nations signified by the locusts, therefore in mercy deliver us from both one and the other.
2:15-27 The priests and rulers are to appoint a solemn fast. The sinner's supplication is, Spare us, good Lord. God is ready to succour his people; and he waits to be gracious. They prayed that God would spare them, and he answered them. His promises are real answers to the prayers of faith; with him saying and doing are not two things. Some understand these promises figuratively, as pointing to gospel grace, and as fulfilled in the abundant comforts treasured up for believers in the covenant of grace.