Gnaneshwar Charitam Vol III Book VIII Chp 2 Shlokas 27 - 28
श्री सद्गुरुरुवाच
इत्युक्त्वा ग्यानदेवोपि पस्पर्श महिषं तदा |
चकार सामगानं स महिषः सुस्वरं बत ||
सर्वेऽपि ब्राह्मणाः सद्य प्रतिष्ठाननिवासिनः |
ग्यानदेवं नमस्कृत्य तुष्टुवुर्ब्रह्मवित्तमम् ||
Shri Sadguru continued
Having spoken thus, Shri Gnanadeva touched his buffalo. The very same moment he started singing the Sama very melodiously. Immediately all the Brahmanas residing at Pratishthanapuram bowed to Gnanadeva, the wise and the brahma gnani.