'Day' in the Bible

For you remember, believers, our labor and hardship. We worked night and day [practicing our trade] in order not to be a [financial] burden to any of you while we proclaimed the gospel of God to you.

We continue to pray night and day most earnestly that we may see you face to face, and may complete whatever may be imperfect and lacking in your faith.

For you yourselves know perfectly well that the day of the [return of the] Lord is coming just as a thief [comes unexpectedly and suddenly] in the night.

But you, believers, [all you who believe in Christ as Savior and acknowledge Him as God’s Son] are not in spiritual darkness [nor held by its power], that the day [of judgment] would overtake you [by surprise] like a thief;

for you are all sons of light and sons of day. We do not belong to the night nor to darkness.

But since we [believers] belong to the day, let us be sober, having put on the breastplate of faith and love, and as a helmet, the hope and confident assurance of salvation.