Shiva Purana
नाभौ बाह्वौः संधिषु च पृष्ठ चैव यथाक्रमम् ॥ प्रक्षाल्य हस्तौ च ततो द्विराचम्य यथाविधि ॥ २६॥
Uttering Pañcīkaraṇa mantra, the scholarly ascetic shall think of his preceptor. In the manner as explained hereafter he shall perform six Prāṇāyāmas.
english translation
nAbhau bAhvauH saMdhiSu ca pRSTha caiva yathAkramam ॥ prakSAlya hastau ca tato dvirAcamya yathAvidhi ॥ 26॥
hk transliteration by Sanscript