Chapter 14 · verse 18 · gita.yoga.org

Bhagavad Gita 14.18

ऊर्ध्वं गच्छन्ति सत्त्वस्था मध्ये तिष्ठन्ति राजसाः।जघन्यगुणवृत्तिस्था अधो गच्छन्ति तामसाः

Those seated in Sattva ascend; those of Rajasic nature dwell in the middle; and those of Tamasic nature, abiding in the function of the lowest Guna, descend.