Matsyapurana 65.4

65.4

akṣayā saṃtatistasyās tasyāṃ sukṛtamakṣayam
akṣataiḥ pūjyate viṣṇus tena sāpyakṣayā smṛtā
akṣataistu narāḥ snātā viṣṇordattvā tathākṣatān //

The progeny of the devotee will be unlimited and her good deeds will have no end, since Viṣṇû is worshipped on that day with Akṣata, it is called Akṣaya tritîyâ. On that day, the devotee should bathe in water mixed with unhusked rice (Akṣata). He should also offer unhusked rice to Viṣṇu and to the Brâhmaṇas, or well-made barley meal (Śaktu) should be offered to the Brâhmaṇas as well as taken by the devotee himself. The devotee who does this gets everlasting benefit.—4-5.