When Bhṛgu Muni offered oblations in the fire, immediately many thousands of demigods named Ṛbhus became manifested. All of them were powerful, having achieved strength from Soma, the moon.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
अध्वर्युणा हूयमाने देवा उत्पेतुरोजसा । ऋभवो नाम तपसा सोमं प्राप्ताः सहस्रशः
adhvaryuṇā hūyamāne devā utpeturojasā | ṛbhavo nāma tapasā somaṃ prāptāḥ sahasraśaḥ
SB 4.4.33