Mahabharata 2.35.3

2.35.3

na hi dharmaṃ paraṃ jātu nāvabudhyeta pārthiva |
bhīṣmaḥ śāṃtanavastvenaṃ māvamaṃsthā ato'nyathā || 3 ||

"Vaisampayana said,--Then the king Yudhishthira hastily ran after Sisupala and spoke unto him sweetly and in a conciliating tone the following words,--'O lord of earth, what thou hast said is scarcely proper for thee. O king, it is highly sinful and needlessly cruel. Insult not Bhishma, O king, by saying that he doth not know what virtue is. Behold, these many kings, older than thou art, all approve of the worship offered unto Krishna. It behoveth thee to bear it patiently like them. O ruler of Chedi, Bhishma knoweth Krishna truly. Thou knowest him not so well as this one of the Kuru race.'"