ACC ~ Acts 2 v20
DO NOT SIN WITH IMPUNITY. CHRYSOSTOM: At the same time, the apostle strikes fear into them by reminding them of the darkness that had lately occurred and leading them to expect things to come. “Before that great and glorious day of the Lord come.” He means: do not be confident because at present you sin with impunity. … Do you see how he shook and shattered their souls and turned laughter into a plea for acquittal? HOMILIES ON THE ACTS OF THE APOSTLES 5.
DAY OF JUDGMENT. BEDE: This is believed partly as something that had been done at the Lord’s passion and partly as something to be done in the future, before the great day of the Lord, that is, the day of judgment. For at that earlier time [of the passion], the sun was darkened,but the turning of the moon into blood could not have appeared openly to humankind, for inasmuch as it was then, at Passover, in the fifteenth [day of the lunar month], the moon was hidden by day from the sight of mortals by the interposition of the earth. COMMENTARY ON THE ACTS OF THE APOSTLES 2.20.
Acts