"And when the thousand years are expired,
Satan shall be loosed out of his prison,
And shall go out to deceive the nations which
are in the four quarters of the earth, Gog and
Magog. . . ." Revelation 20:7,8

Satan will be loose to tempt the people who
were born during the 1000 year millennium
of the people who survived the tribulation
and hadn't died but still lived in their mortal
bodies.