Skanda Purana 16.304.26

16.304.26

pāvitryādbhavatāṃ jātaṃ trainetryaṃ munisattamāḥ ..
evamuktvā tataḥ śaṃbhurdhyānastimitalocanaḥ ..
sasmāra kṣaṇamātreṇa gaṃgāṃ mīnakulāvṛtām .. 26 ..

Your possession of three eyes has arisen from your purity, O best of sages.' / Having spoken thus, Śambhu, his eyes motionless in meditation, / remembered in a mere moment Gaṅgā, crowded with schools of fish.