Chandogya Upanishad 3.9

atha yac caturtham amṛtaṃ tan maruta upajīvanti somena mukhena na vai devā aśnanti na pibanti etad evāmṛtaṃ dṛṣṭvā tṛpyanti

On the fourth of these nectars the Maruts live, with Soma at their head. True, the Devas do not eat or drink, but they enjoy by seeing the nectar.

ta etad eva rūpam abhisaṃviśanti etasmād rūpād udyanti

They enter in that (very dark) colour, and they rise from that colour.

sa ya etad evam amṛtaṃ veda marutām evaiko bhūtvā somenaiva mukhenaitad evāmṛtaṃ dṛṣṭvā tṛpyati sa etad eva rūpam abhisaṃviśati etasmād rūpād udeti

He who thus knows this nectar, becomes one of the Maruts, with Soma at their head, he sees the nectar and rejoices. And he, having entered that colour, rises again from that colour.

sa yāvad ādityaḥ paścād udetā purastād astam etā dvis tāvad uttarata udetā dakṣiṇato 'stam etā marutām eva tāvad ādhipatyaṃ svārājyaṃ paryetā

So long as the sun rises in the west and sets in the east, twice as long does it rise in the north and set in the south; and so long does he follow the sovereign supremacy of the Maruts.