Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 2
तस्य जिज्ञासया ते वै भृगुं ब्रह्मसुतं नृप ।तज्ज्ञप्त्यै प्रेषयामासु: सोऽभ्यगाद् ब्रह्मण: सभाम् ॥ २ ॥
tasya jijñāsayā te vaibhṛguṁ brahma-sutaṁ nṛpataj-jñaptyai preṣayām āsuḥso ’bhjagād brahmaṇaḥ sabhām
Eager to resolve this question, O King, the sages sent Lord Brahmā’s son Bhṛgu to find the answer. First he went to his father’s court.
As Śrīla Prabhupāda explains in Kṛṣṇa, the Supreme Personality of Godhead: “The plan decided upon by the sages was for Bhṛgu to test which one of the predominating deities possessed the quality of goodness in full.” One who is in the mode of goodness possesses such qualities as tolerance and equanimity, whereas those conducted by the modes of passion and ignorance are prone to easily lose their temper.