Skandapurana 16.129.9

16.129.9

anāvṛṣṭihate deśe sasye ca pralayaṃ gate ..
ekaṃ yo bhojayedvipraṃ koṭirbhavati bhojitā .. 9 ..

When the land is struck by drought and the crops have perished, / whoever feeds one brahmin, it is as if ten million have been fed.”