Skanda Purana 16.107.36

16.107.36

yātkāraṃ ca lalāṭāṃte vinyasedvai sureśvari ..
nyāsaṃ kṛtvā''tmano dehe deve kuryāttathā priye .. 36 ..

and he should place the syllable 'yāt' at the edge of the forehead, O ruler of the gods! / Having performed the ritual imposition on his own body, he should likewise perform it on the god, O beloved!