Anandakanda 1.2.59

1.2.59

prāṇāyāmatrayaṃ kṛtvā mūlamantreṇa pārvati /
prokṣayenmantritaṃ toyaṃ mūrdhni vāmakarasthitam //

Having performed breath control three times with the root mantra, O Pārvatī,
he should sprinkle the consecrated water held in his left hand onto his head.