Matsyapurana 68.20

68.20

vipreṇa vedaviduṣā vidhivaddarbhapāṇinā
sthāpayitvā tu caturaḥ kumbhānkoṇeṣu śobhanān //

Four pitchers should be placed in four corners by a Brâhmaṇa versed in the Vedas, with a Kuśa grass in his hand, and a fifth one should be placed in the centre, after filling it in with curds, uncooked rice, etc., reciting the seven Rik verses, and then Agni should be invoked.—20-21.