The leaders of the demons thought it unwise to hold the tail, the inauspicious portion of the snake. Instead, they wanted to hold the front, which had been taken by the Personality of Godhead and the demigods, because that portion was auspicious and glorious. Thus the demons, on the plea that they were all highly advanced students of Vedic knowledge and were all famous for their birth and activities, protested that they wanted to hold the front of the snake.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
तन्नैच्छन् दैत्यपतयो महापुरुषचेष्टितम् । न गृह्णीमो वयं पुच्छमहेरङ्गममङ्गलम्
tannaicchan daityapatayo mahāpuruṣaceṣṭitam | na gṛhṇīmo vayaṃ pucchamaheraṅgamamaṅgalam
SB 8.7.3