The eighth incarnation was King Ṛṣabha, son of King Nābhi and his wife Merudevī. In this incarnation the Lord showed the path of perfection, which is followed by those who have fully controlled their senses and who are honored by all orders of life.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
अष्टमे मेरुदेव्यां तु नाभेर्जात उरुक्रमः । दर्शयन् वर्त्म धीराणां सर्वाश्रमनमस्कृतम्
aṣṭame merudevyāṃ tu nābherjāta urukramaḥ | darśayan vartma dhīrāṇāṃ sarvāśramanamaskṛtam
SB 1.3.13