Samkhya Karika 54

ऊर्ध्वं सत्त्वविशालस्तमोविशालश्च मूलतः सर्गः ।
मध्ये रजोविशालो ब्रह्मादिस्तम्बपर्यन्तः ॥ ५४ ॥

ūrdhvaṁ sattvaviśālastamoviśālaśca mūlataḥ sargaḥ ।
madhye rajoviśālo brahmādistambaparyantaḥ ॥ 54 ॥

ūrdhvaṁ=upper (worlds of Brahmā); sattva=sattva guna; viśālaḥ=prevalent; tamaḥ=tamas guna; viśālaḥ=prevalent; ca=and; mūlataḥ=lower, the nether (world); sargaḥ=creation; madhye=in the middle; rajaḥ=rajas guna; viśālaḥ=prevalent; brahmādi=beginning with Brahmā; stamba=blade of grass; paryantaḥ=up to

Sattva is predominant in the higher regions, tamas in the lower regions and rajas dominates in the middle regions. Such is the creation from Brahma to a blade of grass.