Vijnana Bhairava Tantra Verse 155b

Sanskrit

वरितिन्
सकारेण बहिर्याति हकारेण विषेत् पुनः।
हंसहंसेत्यमुं मन्त्रं जीवो जपति नित्यशः

Transliteration

haṁsahaṁsetyamuṁ mantraṁ jīvo japati nityaśaḥ

Translation

The breath is exhaled with the sound ‘Ha’ and inhaled again with the sound ‘Sa’. Thus the individual always repeats this particular mantra Hamsa.