Shiva Purana
त्रयोदशसहस्रं हि रुद्रै कादशकं द्विजाः । षट्सहस्रं च कैलासं शतरुद्रं तदर्द्धकम् ५३ ।
O brahmins, the Rudraikādasa saṃhitā consisted of thirteen thousand verses; the Kailāsa saṃhitā of six thousand verses and the Śatarudra of three thousand verses.
english translation
trayodazasahasraM hi rudrai kAdazakaM dvijAH । SaTsahasraM ca kailAsaM zatarudraM tadarddhakam 53 ।
hk transliteration by Sanscript