Sacred Ganges water of Bhagavad Gita (Introduction to Bhagavad Gita As It Is)
Hare Krishna Friends,
One cleanses himself daily by taking a bath in water, but one who takes his bath only once in the sacred Ganges water of the Bhagavad Gita cleanses away all the dirt of material life. Because Bhagavad Gita is spoken by the Supreme Personality of Godhead, one need not read any other Vedic literature. One need only attentively and regularly hear and read Bhagavad Gita.
Source: As It Is by HDG. A.C. BhaktiVedanta Swami Srila Prabhupada