KāṭhGS, 26, 11.5 sīrā naḥ sutarā bhava dīrghāyutvāya varcase /

ṚV, 10, 127, 6.2 athā naḥ sutarā bhava //

Ca, Vim., 8, 14.1 na caiva hyasti sutaramāyurvedasya pāraṃ tasmādapramattaḥ śaśvadabhiyogamasmin gacchet etacca kāryam evaṃbhūyaśca vṛttasauṣṭhavamanasūyatā parebhyo 'pyāgamayitavyaṃ kṛtsno hi loko buddhimatāmācāryaḥ śatruścābuddhimatām ataścābhisamīkṣya buddhimatāmitrasyāpi dhanyaṃ yaśasyamāyuṣyaṃ pauṣṭikaṃ laukyam abhyupadiśato vacaḥ śrotavyam anuvidhātavyaṃ ceti /