Matsyapurana 3.30

3.30

sāvitrīṃ lokasṛṣṭyarthe hṛdi kṛtvā samāsthitaḥ
tataḥ saṃjapatas tasya bhitvā deham akalmaṣam //

Lord Brahmâ, after creating His mânasa putras, was not quite satisfied with the work of His creation. He set about devising some plan which would carry on the work of creation and would relieve Him of the task. With this view, He began to invoke Gâyatri. After some time the goddess Gâyatri, known under different names, _viz._—Satarûpâ, Sâvitrî, Sarasvatî, Brahmâṇi, &c.,—appeared in the form of a girl from the half portion of Brahmâs body who at the first sight mistakenly took Her for His daughter. Afterwards, the Creator, seeing that form of exquisite beauty, was fired with love and repeatedly uttered, "What an enchanting form!"—30-33.