Visuddhimagga III-52

Karuḷiyagirivāsīnāgattheropi aṭṭhārasavassāni pariyattiṃ chaḍḍetvā bhikkhūnaṃ dhātukathaṃ uddisi. Tesaṃ gāmavāsikattherehi saddhiṃ saṃsandentānaṃ ekapañhopi uppaṭipāṭiyā āgato nāhosi.

又一位住在迦罗利耶山的龙长老业已放弃经本十八年，一但为诸比丘说《界论》（南传的七论之一），他们和住在村中的长老顺次校对，亦无一个问题错误。

Ñ(III,52): The Elder Mahā-Nāga, too, who lived at Karuliyagiri (Karaliyagiri) put aside the scriptures for eighteen years, and then he recited the Dhātukathā to the bhikkhus. When they checked this with the town-dwelling elders [of Anurādhapura], not a single question was found out of its order.