Paraskaragrihyasutra 2.14.22

2.14.22

anuguptametaṃ saktuśeṣaṃ nidhāya tato 'stamite 'stamite 'gniṃ paricarya darvyopaghātaṃ saktūnsarpebhyo baliṃ haredāgrahāyaṇyāḥ \22\

Having put away that remainder of flour in a hidden place, he should from that time daily till the Âgrahâyanî, after sunset, when he has performed the service to the fire, offer to the serpents a Bali of flour, picking out (portions of it) with the Darvî (spoon).