Caitanya-caritāmṛta 8.38
‘caitanya-maṅgala’ śune yadi pāṣaṇḍī, yavana seha mahā-vaiṣṇava haya tatakṣaṇa
[‘chaitanya-mangala’ shune yadi paashandee, yavana seha mahaa-vaishnava haya tatakshana]
Blended reading (Sanskrit + English inline)
‘caitanya-maṅgala’ śune yadi pāṣaṇḍī, yavana seha mahā-vaiṣṇava haya tatakṣaṇa
If even a great atheist hears Śrī Caitanya-maṅgala, he immediately becomes a great devotee.
My note
Source: vedabase.io