Anandakanda 1.3.18

1.3.18

prakṣālya pādau pāṇī ca samācamya gurūttamaḥ /
nijāsanaṃ samāsādya prāṇāyāmatrayaṃ tathā //

Having washed both feet and hands and properly sipped water, the best of gurus, / having reached his own seat, [should perform] the three prāṇāyāmas as well.