GB, 1, 1, 8, 4.0 tebhyaḥ śrāntebhyas taptebhyaḥ saṃtaptebhyo daśatayān āṅgirasān ārṣeyān niramimīta ṣoḍaśino 'ṣṭādaśino dvādaśina ekarcān dvyṛcāṃs tṛcāṃś caturṛcān pañcarcān ṣaḍarcān saptarcān iti //

ŚāṅkhŚS, 13, 23, 8.0 dvādaśī viṣuvān sarpasattrasya //