19 I will show wonders in the sky above, and signs on the earth beneath: blood, and fire, and billows of smoke.
Acts 2:19 Cross References - WEB
Joel 2:30-31
Zephaniah 1:14-18
14 The great day of Yahweh is near. It is near, and hurries greatly, the voice of the day of Yahweh. The mighty man cries there bitterly.
15 That day is a day of wrath, a day of distress and anguish, a day of trouble and ruin, a day of darkness and gloom, a day of clouds and blackness,
16 a day of the trumpet and alarm, against the fortified cities, and against the high battlements.
17 I will bring distress on men, that they will walk like blind men, because they have sinned against Yahweh, and their blood will be poured out like dust, and their flesh like dung.
18 Neither their silver nor their gold will be able to deliver them in the day of Yahweh’s wrath, but the whole land will be devoured by the fire of his jealousy; for he will make an end, yes, a terrible end, of all those who dwell in the land.
Malachi 4:1-6
1 “For, behold, the day comes, it burns as a furnace; and all the proud, and all who work wickedness, will be stubble; and the day that comes will burn them up,” says Yahweh of Armies, “that it shall leave them neither root nor branch.
2 But to you who fear my name shall the sun of righteousness arise with healing in its wings. You will go out, and leap like calves of the stall.
3 You shall tread down the wicked; for they will be ashes under the soles of your feet in the day that I make,” says Yahweh of Armies.
4 “Remember the law of Moses my servant, which I commanded to him in Horeb for all Israel, even statutes and ordinances.
5 Behold, I will send you Elijah the prophet before the great and terrible day of Yahweh comes.
6 He will turn the hearts of the fathers to the children, and the hearts of the children to their fathers, lest I come and strike the earth with a curse.”