Matsyapurana 4.7

4.7

anyacca sarvavedānām adhiṣṭhātā caturmukhaḥ
gāyatrī brahmaṇastadvad aṅgabhūtā nigadyate //

Besides this, as Lord, Brahmâ is the governor of the Vedas, so is the goddess Gâyatrî of the Brahmans (the sacred text, *i.e.*, the Vedas). She is the better-half of the Lord, and that is why she appeared from His body. Brahmâ and Gâyatrî are inseparables. Sometimes only one of the two puts on appearance and sometimes both do the same, but all the same both are always together. They never remain apart. As sunshine or light never lives devoid of its shadow, similarly Brahmâ never lives apart from Gâyatrî. Brahmâ is the master of the Vedas and Sâvitrî (another name for Gâyatrî), is the governess of the same; Brahmâ is therefore also the master of the latter, and consequently He committed no sin by marrying Her.—7-10.