Kaushitakagrihyasutra 2.8.8

2.8.8

brahmacārī pravatsyannācāryamanumantrayate prāṇāpānayoḥ ityupāṃśu idaṃ vatsyāvo bho ityuccaiḥ \8\

The student, when about to go on a journey, addresses the preceptor with: “Of inhalation and exhalation…” in a low voice, and loudly with: “We shall dwell here, sir!”