Commentaries
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.
27. know that I am in the midst of Israel—As in the Old Testament dispensation God was present by the Shekinah, so in the New Testament first, for a brief time by the Word made flesh dwelling among us (Joh 1:14), and to the close of this dispensation by the Holy Spirit in the Church (Mt 28:20), and probably in a more perceptible manner with Israel when restored (Eze 37:26-28).
never be ashamed—not an unmeaning repetition from Joe 2:26. The twice-asserted truth enforces its unfailing certainty. As the "shame" in Joe 2:26 refers to temporal blessings, so in this verse it refers to the spiritual blessings flowing from the presence of God with His people (compare Jer 3:16, 17; Re 21:3).