Matsyapurana 2.36

2.36

mṛte 'ṇḍe jāyate yasmān mārtaṇḍas tena saṃsmṛtaḥ
rajoguṇamayaṃ yattad rūpaṃ tasya mahātmanaḥ
caturmukhaḥ sa bhagavān abhūl lokapitāmahaḥ //

The Sun, owing to its flashing out of the Brahmâṇḍa at the time of its breaking, *i.e.*, being divided into two parts, is known by the name of Mârtaṇḍa, and the image of the Creator, Brahmâ, the four-headed Deity, who is full of the element of Rajoguṇa came to be called as Mahâtman.—36.