One verse

Srimad Bhagavatam 10.1.16

10.1.16

वासुदेवकथाप्रश्न: पुरुषांस्त्रीन् पुनाति हि । वक्तारं प्रच्छकं श्रोतृंस्तत्पादसलिलं यथा ॥ १६ ॥

vāsudeva-kathā-praśnaḥ puruṣāṁs trīn punāti hi vaktāraṁ pracchakaṁ śrotṝṁs tat-pāda-salilaṁ yathā

vāsudeva-kathā-praśnaḥ
questions about the pastimes and characteristics of Vāsudeva, Kṛṣṇa
puruṣān
persons
trīn
three
punāti
purify
hi
indeed
vaktāram
the speaker, such as Śukadeva Gosvāmī
pracchakam
and an inquisitive hearer like Mahārāja Parīkṣit
śrotṝn
and, between them, the listeners hearing about the topics
tat-pāda-salilam yathā
exactly as the entire world is purified by the Ganges water emanating from the toe of Lord Viṣṇu

The Ganges, emanating from the toe of Lord Viṣṇu, purifies the three worlds, the upper, middle and lower planetary systems. Similarly, when one asks questions about the pastimes and characteristics of Lord Vāsudeva, Kṛṣṇa, three varieties of men are purified: the speaker or preacher, he who inquires, and the people in general who listen.