When the embodied one happens to die with sattva in predominance, then he attains the pure regions meant for the most learned ones.
The effect of predominance of each guna is not only while one is living upon the earth, but also extends to the period following the fall of his body.
As is life pleasant and unpleasant here, so it will be after one drops his body. What lives is not the body, but the embodied soul. Dropping the body, the jeeva continues to reign. Where, becomes the instant question. The answer is that it will be in good, lofty and pleasant regions or their opposites.
Sattva-guna, if dominant, ensures that after the body falls, the one living in it, will get his tenure in the best, holy, comfortable regions, where the best of learned people go. Sattva’s influence and rewards do not exhaust with the so called ‘death’, but continue to grace the jeeva.