“the Lamb who is in the midst of the throne will shepherd them and lead them to living fountains of waters. And God will wipe away every tear from their eyes” (Revelation 7:17 NKJV).

Those believers who “come out of the great tribulation” will dwell with the Lamb, who is the Lord Jesus Christ. He will shepherd them as David’s Psalm 23 described. And the tears of their tribulation will be wiped away by the Lord Himself.
No more hunger, no more thirst, no more crying, for the Lord Himself will shepherd them.