SB 1.13.12

ity ukto dharma-rājena
 sarvaṁ tat samavarṇayat
yathānubhūtaṁ kramaśo
 vinā yadu-kula-kṣayam
Synonyms: 
iti — thus; uktaḥ — being asked; dharma-rājena — by King Yudhiṣṭhira; sarvam — all; tat — that; samavarṇayat — properly described; yathā-anubhūtam — as he experienced; kramaśaḥ — one after another; vinā — without; yadu-kula-kṣayam — annihilation of the Yadu dynasty.
Translation: 
Thus being questioned by Mahārāja Yudhiṣṭhira, Mahātmā Vidura gradually described everything he had personally experienced, except news of the annihilation of the Yadu dynasty.