'Day' in the Bible

But who can abide the day of his coming? and who shall stand when he appeareth? for he is like a refiner's fire, and like fuller's soap:

And they shall be mine, saith Jehovah of hosts, even mine own possession, in the day that I make; and I will spare them, as a man spareth his own son that serveth him.

For, behold, the day cometh, it burneth as a furnace; and all the proud, and all that work wickedness, shall be stubble; and the day that cometh shall burn them up, saith Jehovah of hosts, that it shall leave them neither root nor branch.

And ye shall tread down the wicked; for they shall be ashes under the soles of your feet in the day that I make, saith Jehovah of hosts.

Behold, I will send you Elijah the prophet before the great and terrible day of Jehovah come.