Lord Kṛṣṇa was sent by Arjuna into the assembly as the spiritual master of the whole world, and although His words were heard by some [like Bhīṣma] as pure nectar, it was not so for the others, who were completely bereft of the last farthing of past pious works. The King [Dhṛtarāṣṭra or Duryodhana] did not take the words of Lord Kṛṣṇa very seriously.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
यदा च पार्थप्रहितः सभायां जगद्गुरुर्यानि जगाद कृष्णः । न तानि पुंसाममृतायनानि राजोरु मेने क्षतपुण्यलेशः
yadā ca pārthaprahitaḥ sabhāyāṃ jagadgururyāni jagāda kṛṣṇaḥ | na tāni puṃsāmamṛtāyanāni rājoru mene kṣatapuṇyaleśaḥ
SB 3.1.9