Vṛṣṇivaṃśa–Anukīrtana (Enumeration of the Vṛṣṇi Lineage) — Questions on Viṣṇu’s Human Descent
भावौ रसानुगावेतौ वीर्ये च शशिपावकौ / कफवर्गे भवेच्छुक्रं पित्तवर्गे च शोणितम्
bhāvau rasānugāvetau vīrye ca śaśipāvakau / kaphavarge bhavecchukraṃ pittavarge ca śoṇitam
Bhāva and rasa are said to follow one another; in vīrya abide the natures of moon and fire. In the kapha class arises śukra, and in the pitta class arises śoṇita (blood).