Who knoweth if he will {k} return and repent, and leave a blessing behind him; even a meat offering and a drink offering unto the LORD your God?

(k) He speaks this to stir up their slothfulness, and not that he doubted of God's mercies, if they did repent. For the way in which God repents, read Geneva Jer 18:8

Wesley's Notes

2:14 He will return - God doth not move from one place to another; but when he withholds his blessings, he is said to withdraw himself. And so when he gives out his blessing, he is said to return. And leave a blessing behind him - Cause the locusts to depart before they have eaten up all that is in the land.

Jamieson-Fausset-Brown Bible Commentary

14. leave . a meat offering and a drink offering-that is, give plentiful harvests, out of the first-fruits of which we may offer the meat and drink offering, now "cut off" through the famine (Joe 1:9, 13, 16). "Leave behind Him": as God in visiting His people now has left behind Him a curse, so He will, on returning to visit them, leave behind Him a blessing.

Matthew Henry's Concise Commentary

2:1-14 The priests were to alarm the people with the near approach of the Divine judgments. It is the work of ministers to warn of the fatal consequences of sin, and to reveal the wrath from heaven against the ungodliness and unrighteousness of men. The striking description which follows, shows what would attend the devastations of locusts, but may also describe the effects from the ravaging of the land by the Chaldeans. If the alarm of temporal judgments is given to offending nations, how much more should sinners be warned to seek deliverance from the wrath to come! Our business therefore on earth must especially be, to secure an interest in our Lord Jesus Christ; and we should seek to be weaned from objects which will soon be torn from all who now make idols of them. There must be outward expressions of sorrow and shame, fasting, weeping, and mourning; tears for trouble must be turned into tears for the sin that caused it. But rending the garments would be vain, except their hearts were rent by abasement and self-abhorrence; by sorrow for their sins, and separation from them. There is no question but that if we truly repent of our sins, God will forgive them; but whether he will remove affliction is not promised, yet the probability of it should encourage us to repent.