शनैर्दहन्ति पापानि कल्पकोटिशतानि च ।
अश्वत्थसन्निधौ पार्थ ध्यात्वा मनसि केशवम् ॥

Meaning:
O Arjuna ! having meditated on ViShNu in the vicinity of the holy fig tree, people slowly burn out millions and millions of sins.

Word meanings:
शनैः = slowly;
दहन्ति = burn;
पापानि = sins;
कल्पकोटिशतानि = many literally (kalpa is 10 raised to 18, koTi
is 10 raised to 8 and shata is 10 raised to 2 so in all 10 raised to 20);
च = and;
अश्वत्थसन्निधौ = in the presence of the Peepal tree;
पार्थ = Oh! Partha (refers to Arjun);
ध्यात्वा = by meditating, thinking;
मनसि = in the mind;
केशवं = Keshava (Krishna);