Garudapurana 1.106.25

1.106.25

piṇyākamūlagandhāṃśca vaiśyavṛtto na vikrayet /
dharmārthaṃ vikrayaṃ neyāstilā dhānyena tatsamāḥ //

oil-cake, roots, and perfumes—he following the livelihood of a vaiśya should not sell [these]. / For religious duty, sesame seeds equal in measure may be exchanged for grain.