Dakṣa began a sacrifice named vājapeya, and he became excessively confident of his support by Lord Brahmā. He then performed another great sacrifice, named bṛhaspati-sava.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
इष्ट्वा स वाजपेयेन ब्रह्मिष्ठानभिभूय च । बृहस्पतिसवं नाम समारेभे क्रतूत्तमम्
iṣṭvā sa vājapeyena brahmiṣṭhānabhibhūya ca | bṛhaspatisavaṃ nāma samārebhe kratūttamam
SB 4.3.3