Matsyapurana 81.13

81.13

evaṃ saṃpūjya govindaṃ phalamālyānulepanaiḥ.
tatastu maṇḍalaṃ kṛtvā staṇḍilaṃ kārayenmṛdā.. 81.12 ..

Thus worshiping Viṣṇu with sandal, fruits and flowers, an altar should be made on the ground after making a circle.—12.