2:31 The {t} sun shall be turned into darkness, and the moon into blood, before the great and the terrible day of the LORD come.

(t) The order of nature will seem to be changed because of the horrible afflictions that will be in the world; Isa 13:10 Eze 32:7 Joe 3:15 Mt 24:29.

2:31 The sun - Having mentioned the prodigies which were to be wrought on earth, he now specifies what shall be done in heaven. The terrible day - The unholy day of the destruction of Jerusalem; typifying the day of judgment.

2:28-32 The promise began to be fulfilled on the day of Pentecost, when the Holy Spirit was poured out, and it was continued in the converting grace and miraculous gifts conferred on both Jews and Gentiles. The judgments of God upon a sinful world, only go before the judgment of the world in the last day. Calling on God supposes knowledge of him, faith in him, desire toward him, dependence on him, and, as evidence of the sincerity of all this, conscientious obedience to him. Those only shall be delivered in the great day, who are now effectually called from sin to God, from self to Christ, from things below to things above.