One who gives oblations of water to his departed manes at Saptaganga and Triganga and Indramarga, obtains ambrosia for food if one has still to go through rebirth.
सप्तगङ्गे त्रिगङ्गे च इन्द्रमार्गे च तर्पयन्॥ सुधां वै लभते भोक्तुं यो नरो जायते पुनः।