Caitanya-caritāmṛta 4.231
‘ṣaṭ sandarbhe’ kṛṣṇa-prema-tattva prakāśila cāri-lakṣa grantha teṅho vistāra karila
[‘shat sandarbhe’ krishna-prema-tattva prakaashila chaari-laksha grantha tenho vistaara karila]
Blended reading (Sanskrit + English inline)
‘ṣaṭ sandarbhe’ kṛṣṇa-prema-tattva prakāśila cāri-lakṣa grantha teṅho vistāra karila
In the Ṣaṭ-sandarbha Śrīla Jīva Gosvāmī set forth the truths about transcendental love of Kṛṣṇa. In this way he expanded 400,000 verses in all his books.
My note
Source: vedabase.io