(20) The sun shall be turned into darkness.--Both clauses bring before us the phenomena of an eclipse: the total darkness of the sun, the dusky copper hue of the moon. Signs, of which these were but faint images, had been predicted by our Lord, echoing, as it were, the words of Joel, as among the preludes of His Advent (Matthew 24:29).

That great and notable day.--St. Luke follows the LXX. version. The Hebrew gives, as in our version, "the great and terrible day." As seen by the prophet, the day was terrible to the enemies of God; a day of blessing to "the remnant whom the Lord should call" (Joel 2:32). The Greek word for "notable" (epiphanes) lent itself readily to the thought of the great Epiphany or manifestation of Christ as the Judge of all.

Verse 20. - The day of the Lord come, that great and notable day for that great and notable day of the Lord come, A.V. and T.R.

2:14-21 Peter's sermon shows that he was thoroughly recovered from his fall, and thoroughly restored to the Divine favour; for he who had denied Christ, now boldly confessed him. His account of the miraculous pouring forth of the Spirit, was designed to awaken the hearers to embrace the faith of Christ, and to join themselves to his church. It was the fulfilling the Scripture, and the fruit of Christ's resurrection and ascension, and proof of both. Though Peter was filled with the Holy Ghost, and spake with tongues as the Spirit gave him utterance, yet he did not think to set aside the Scriptures. Christ's scholars never learn above their Bible; and the Spirit is given, not to do away the Scriptures, but to enable us to understand, approve, and obey them. Assuredly none will escape the condemnation of the great day, except those who call upon the name of the Lord, in and through his Son Jesus Christ, as the Saviour of sinners, and the Judge of all mankind.The sun shall be turned into darkness,.... As at the death of Christ, by a total eclipse of it:

and the moon into blood; as at the opening of the sixth seal, Revelation 6:12.

before that great and notable day of the Lord come; when he shall come in power and great glory, as he did in a few years after this, to take vengeance on the Jews, and destroy their nation, city, and temple; in which there was a display of his greatness, and power, and which was awful and "terrible" to them, as in Joel it is called; see Gill on Matthew 24:29.