Sloka Bhagavad Gita Kinchitha Theerthaa is taken from "Bhaja Govindam" composed by Jagadguru Adi Shankaracharya. Sloka Bhagavad Gita Kinchitha Theerthaa means, "If one reads a little bit of the Bhagavad Gita, drinks a drop of water from Ganga, and if he worships Krishna even for a small moment, he won't have any tiffs with Yama", the lord of death.
भगवद् गीता किञ्चिदधीता गङ्गा जललव कणिकापीता ।
सकृदपि येन मुरारि समर्चा क्रियते तस्य यमेन न चर्चा ॥
Bhagavad Gita Kinchitha Theerthaa Gangaa Jalalapi Kanikaa Peetha
Sakruthapi Yaena Muraari Samarchaa Kriyathe Thasya Yamenana Charcha
If a person reads a little from Bhagavad Geeta, Drinks a sip of water from Ganges. Worships Murari (Krishna) for a little moment, for them there is no arguments with Yama, [the lord of death].