Bhagavatapurana 10.84.31

10.84.31

sannikarṣo 'tra martyānām anādaraṇa-kāraṇam /
gāṅgaṃ hitvā yathānyāmbhas tatratyo yāti śuddhaye //

31. Here proximity is the cause of men’s neglecting (the most valuable things at hand): for a person living on the banks of the Ganges leaves it and goes to some other distant water for the sake of purification.