Garudapurana 1.128.10

1.128.10

nakṣatradarśanānnaktamanaktaṃ niśi bhojanam /
gomūtraṃ ca pala dadyādardhāṅguṣṭhaṃ tu gomayam //

From the sighting of stars comes the night-fast meal; eating at night is not a night-fast meal.
One should give a pala of cow-urine, and cow-dung the size of half a thumb;