'Day' in the Bible

Will I not, in that day, says the Lord, take away the wise men out of Edom, and wisdom out of the mountain of Esau?

Do not see with pleasure your brother's evil day, the day of his fate, and do not be glad over the children of Judah on the day of their destruction, or make wide your mouth on the day of trouble.

Do not go into the doors of my people on the day of their downfall; do not be looking on their trouble with pleasure on the day of their downfall, or put your hands on their goods on the day of their downfall.

And do not take your place at the cross-roads, cutting off those of his people who get away; and do not give up to their haters those who are still there in the day of trouble.

For the day of the Lord is coming quickly on all nations: as you have done it will be done to you; the reward of your acts will come on your head.