Shiva Purana
सोपि सर्वं च तत्रत्यन्दुर्योधनगुणोदयम् ॥ समीचीनं च तज्ज्ञात्वापुनः प्राप प्रभून्प्रति॥ १९ ॥
He understood the prosperity, rise and the virtues of Duryodhana and returned to the Pāṇḍavas again.
english translation
sopi sarvaM ca tatratyanduryodhanaguNodayam ॥ samIcInaM ca tajjJAtvApunaH prApa prabhUnprati॥ 19 ॥
hk transliteration by Sanscript