When Lord Brahmā appointed Dakṣa the chief of all the Prajāpatis, the progenitors of population, Dakṣa became very much puffed up.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
यदाभिषिक्तो दक्षस्तु ब्रह्मणा परमेष्ठिना । प्रजापतीनां सर्वेषामाधिपत्ये स्मयोऽभवत्
yadābhiṣikto dakṣastu brahmaṇā parameṣṭhinā | prajāpatīnāṃ sarveṣāmādhipatye smayo'bhavat
SB 4.3.2