guṇatrayavibhāgayoga - Verse śloka 18
śloka 18
ūrdhvaṃ gacchanti sattvasthā madhye tiṣṭhanti rājasāḥ |
jaghanyaguṇavṛttisthā adho gacchanti tāmasāḥ ||14-18||
Translation
Those established in Sattva go to the higher (worlds); those of Rajas nature dwell in the middle (the human world); and those established in the basest tendencies of Tamas attain the lower states.