Vishnupurana 3.10.24

3.10.24

brāhmo daivastathaivārṣaḥ prājāpatyastathāsuraḥ /
gāndharvarākṣayau cānyau paiśācaś cāṣṭamo mataḥ //

"The forms of marriage are eight, the Brahmá, Daiva, the Ársha, Prájápatya, Asúra, Gándharba, Rákshasa, and Paiśácha; which last is the worst: but the caste to which either form has been enjoined as lawful by inspired sages should avoid any other mode of taking a wife. The householder who espouses a female connected with him by similarity of religious and civil obligations, and along with her discharges the duties of his condition, derives from such a wife great benefits."