8. Who—God, 1Co 1:4 (not Jesus Christ, 1Co 1:7, in which case it would be "in His day").
unto the end—namely, "the coming of Christ."
blameless in the day of … Christ—(1Th 5:23). After that day there is no danger (Eph 4:30; Php 1:6). Now is our day to work, and the day of our enemies to try us: then will be the day of Christ, and of His glory in the saints [Bengel].