Narasimhapurana 58.9

58.9

pitṛkāryaṃ ca tatkāle narasiṃhārcanaṃ tathā
etad vaiśyasya karmoktaṃ svadharmam anutiṣṭataḥ //

as well as rites for the ancestors at the proper time, and the worship of Narasiṃha. / This has been declared the duty of a vaiśya who abides by his own duty;