Mahabharata 3.222.5

3.222.5

tava vaśyā hi satataṃ pāṇḍavāḥ priyadarśane |
mukhaprekṣāśca te sarve tattvametadbravīhi me || 5 ||

Vaisampayana said, "After those Brahmanas and the illustrious sons of Pandu had taken their seats, Draupadi and Satyabhama entered the hermitage. And with hearts full of joy the two ladies laughed merrily and seated themselves at their ease. And, O king, those ladies, who always spake sweetly to each other, having met after a long time, began to talk upon various delightful topics arising out of the stories of the Kurus and the Yadus. And the slender-waisted Satyabhama, the favourite wife of Krishna and the daughter of Satrajit, then asked Draupadi in private, saying, 'By what behaviour is it, O daughter of Drupada, that thou art able to rule the sons of Pandu--those heroes endued with strength and beauty and like unto the Lokapalas themselves? Beautiful lady, how is it that they are so obedient to thee and are never angry with thee? Without doubt the sons of Pandu, O thou of lovely features, are ever submissive to thee and watchful to do thy bidding!

[paragraph continues] Tell me, O lady, the reason of this. Is it practice of vows, or asceticism, or incantation or drug at the time of the bath (in season) or the efficacy of science, or the influence of youthful appearance, or the recitation of particular formulae, or Homa, or collyrium and other medicaments? Tell me now, O princess of Panchala, of that blessed and auspicious thing by which, O Krishna, Krishna may ever be obedient to me."