Garudapurana 1.83.25

1.83.25

kūpe piṇḍādikaṃ kṛtvā pitṝṇāmanṛṇo bhavem /
tathākṣayavaṭe śrāddhī brahmalokaṃ nayetpitṝn //

By offering a ball of rice and other rites at the well, one becomes free of debt to the ancestors; / likewise, one who performs an ancestral rite at the Akṣayavaṭa leads the ancestors to the world of Brahmā.