Mahabharata 12.59.88
वैशालाक्षमिति प्रोक्तं तदिन्द्रः प्रत्यपद्यतदशाध्यायसहस्राणि सुब्रह्मण्यो महातपाः
vaiśālākṣamiti proktaṃ tadindraḥ pratyapadyatadaśādhyāyasahasrāṇi subrahmaṇyo mahātapāḥ
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book