Revelation, chapter 14
"1": And I looked, and, lo, a Lamb stood on the mount Sion, and with him an hundred forty and four thousand, having his Father's name written in their foreheads.
"2": And I heard a voice from heaven, as the voice of many waters, and as the voice of a great thunder: and I heard the voice of harpers harping with their harps:
"3": And they sung as it were a new song before the throne, and before the four beasts , and the elders: (before the throne of God) and no man could learn that song but the hundred and forty and four thousand, which were redeemed from the earth.
"4": These are they which were not defiled with women; for they are virgins. These are they which follow the Lamb whithersoever he goeth. These were redeemed from among men, being the firstfruits unto God and to the Lamb.
"5": And in their mouth was found no guile: for they are without fault before the throne of God.
"6": And I saw another angel fly in the midst of heaven, having the everlasting gospel to preach unto them that dwell on the earth , (no need to preach when the wrath is getting ready to be pour out) and to every nation, and kindred, and tongue, and people,
"7": Saying with a loud voice, Fear God, and give glory to him; for the hour of his judgment is come: and worship him that made heaven, and earth, and the sea, and the fountains of waters.
"8": And there followed another angel, saying, Babylon is fallen, is fallen, that great city, because she made all nations drink of the wine of the wrath of her fornication.
"9": And the third angel followed them, saying with a loud voice, If any man worship the beast and his image, and receive his mark in his forehead, or in his hand,
"10": The same shall drink of the wine of the wrath of God, which is poured out without mixture into the cup of his indignation; and he shall be tormented with fire and brimstone in the presence of the holy angels, and in the presence of the Lamb:
"11": And the smoke of their torment ascendeth up for ever and ever: and they have no rest day nor night, who worship the beast and his image, and whosoever receiveth the mark of his name.
"12": Here is the patience of the saints: here are they that keep the commandments of God, and the faith of Jesus.
"13": And I heard a voice from heaven saying unto me, Write, Blessed are the dead which die in the Lord from henceforth: Yea, saith the Spirit, that they may rest from their labours; and their works do follow them.
It is talking about a longer period of time than just before the wrath, it seems that having their Fathers name written in their foreheads and having the seal might be and I say might be two different things. .