Bhagavatapurana 3.20.52

3.20.52

tapasā vidyayā yukto yogena susamādhinā /
ṛṣīn ṛṣir hṛṣīkeśaḥ sasarjābhimatāḥ prajāḥ //

52. Possessed of Tapas and the power of meditation, of Yoga (in respect of posture etc.) with intense power of concentration (joined to renunciation and other virtues), and also possessed of perfect control over his senses, the sage Brahma created the Rishis, creatures most beloved of him.