'Day' in the Bible

But who can endure the day of His coming? And who can stand when He appears? For He is like a refiner’s fire and like launderer’s soap [which removes impurities and uncleanness].

“They will be Mine,” says the Lord of hosts, “on that day when I publicly recognize them and openly declare them to be My own possession [that is, My very special treasure]. And I will have compassion on them and spare them as a man spares his own son who serves him.”

“For behold, the day is coming, burning like a furnace, and all the arrogant (proud, self-righteous, haughty), and every evildoer shall be stubble; and the day that is coming shall set them on fire,” says the Lord of hosts, “so that it will leave them neither root nor branch.

You will trample the wicked, for they will be ashes under the soles of your feet on the day that I do this,” says the Lord of hosts.

“Behold, I am going to send you Elijah the prophet before the coming of the great and terrible day of the Lord.