Garudapurana 2.5.36

2.5.36

sarvamarmāṇi ṣaṣṭhena saptamena tu nāḍayaḥ /
dantalomānyaṣṭamena vīryantu navamena ca //

all vital points by the sixth, and the channels by the seventh; / teeth and body hair by the eighth, and semen by the ninth;