SB 3.1.41

saumyānuśoce tam adhaḥ-patantaṁ
 bhrātre paretāya vidudruhe yaḥ
niryāpito yena suhṛt sva-puryā
 ahaṁ sva-putrān samanuvratena
Word for word: 
saumya — O gentle one; anuśoce — I lament; tam — him; adhaḥ-patantam — gliding down; bhrātre — on his brother’s; paretāya — death; vidudruhe — revolted against; yaḥ — one who; niryāpitaḥ — driven out; yena — by whom; suhṛt — well-wisher; sva-puryāḥ — from his own house; aham — myself; sva-putrān — with his own sons; samanu-vratena — accepting the same line of action.
Translation: 
O gentle one, I simply lament for him [Dhṛtarāṣṭra] who rebelled against his brother after death. By him I was driven out of my own house, although I am his sincere well-wisher, because he accepted the line of action adopted by his own sons.
Purport: 

Vidura did not ask about the welfare of his elder brother because there was no chance of his well-being, only news of his gliding down to hell. Vidura was a sincere well-wisher for Dhṛtarāṣṭra, and he had a thought about him in the corner of his heart. He lamented that Dhṛtarāṣṭra could rebel against the sons of his dead brother Pāṇḍu and that he could drive him (Vidura) out of his own house on the dictation of his crooked sons. In spite of these actions, Vidura never became an enemy of Dhṛtarāṣṭra but continued to be his well-wisher, and at the last stage of Dhṛtarāṣṭra’s life, it was Vidura only who proved to be his real friend. Such is the behavior of a Vaiṣṇava like Vidura: he desires all good, even for his enemies.