Mahabharata 15.17.1

वैशंपायन उवाच · vaiśaṃpāyana uvāca

व्युषितायां रजन्यां तु धृतराष्ट्रोऽम्बिकासुतःविदुरं प्रेषयामास युधिष्ठिरनिवेशनम्

vyuṣitāyāṃ rajanyāṃ tu dhṛtarāṣṭro'mbikāsutaḥviduraṃ preṣayāmāsa yudhiṣṭhiraniveśanam

Our plain-language meaning of this verse is waiting for scholar review.