Vayupurana 1.26.21

Vāyupurāṇa 1.26.21

tataḥ punardvimātraṃ tu cintayāmāsa cākṣaram.
prādurbhūtaṃ ca raktaṃ tacchedane gṛhya sā yajuḥ .. 26.19 ..