Mahabharata 13.135.36
गुरुर्गुरुतमो धाम सत्यः सत्यपराक्रमःनिमिषोऽनिमिषः स्रग्वी वाचस्पतिरुदारधीः
gururgurutamo dhāma satyaḥ satyaparākramaḥnimiṣo'nimiṣaḥ sragvī vācaspatirudāradhīḥ
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book