Gnaneshwar Charitam Vol III Book VIII Chp 2 Shlokas 6 - 7
आसीद्विट्ठलदासाख्यो ब्राह्मणो वेदवित्तमः |
रुक्मिण्या भार्यया सार्धं गार्हस्थ्यं धर्ममाचरन् ||
तयोर्ब्राह्मणदम्पत्योः पुत्राक्ष्चासन् तपस्विनोः |
निवृत्तिज्ञानसोपानदेवा ब्रह्मविदां वराः ||
There was a great brahmana, greatest among the exponents of the Vedas, named Vitthaladasa leading a happy married life with his wife Rukmini. Three brahma gnanis were born as the sons of this couple. They were, named Nivrittideva, Gnanadeva and Sopanadeva.
