Dakshasmriti 2.38

2.38

sandhyāsnānamubhābhyāñca snānabhedāḥ prakīrtitāḥ
mārjanaṃ jalamadhye tu prāṇāyāmo yatastataḥ

and the twilight devotion bath—by these two kinds, the divisions of bathing are proclaimed. / Sprinkling is done in the midst of water, and breath control wherever appropriate;