Matsyapurana 17.15

17.15

pūrayetpātrayugmaṃ tu sthāpya darbhapavitrakam
śaṃ no devīty apaḥ kuryād yavo 'sīti yavānapi //

Two vessels should be placed with kuśa rings, and water should be poured in one, after uttering, "*Om Śanno Devî,*" etc., and barley should be put in the other, after uttering, "Om yavo si." etc. Flower and sandal should also be put in the vessels offered to the Vaiśva devas with the mantra, "Om Viśvedevâ," etc., who should be thus invoked and barley should be thrown. After offering flowers and sandal, the host should offer Arghya water to them with the mantra "Yâdivya" &c. When the Viśvadeva worship is finished, the Pitṛi worship should be commenced.—15-17.