Mbh 13.44.2a

"'Bhishma said, "Having enquired into the conduct and disposition of the person, his learning and acquirements, his birth, and his acts, good people should then bestow their daughter upon accomplished bridegrooms. All righteous Brahmanas, O Yudhishthira, act in this way (in the matter of the bestowal of their daughters). This is known as the Brahma marriage, O Yudhishthira! Selecting an eligible bridegroom, the father of the girl should cause him to marry his daughter, having, by presents of diverse kinds, induced the bridegroom to that act. This form of marriage constitutes the eternal practice of all good Kshatriyas. When the father of the girl, disregarding his own wishes, bestows his daughter upon a person whom the daughter likes and who reciprocates the girl's sentiments, the form of marriage, O Yudhishthira, is called Gandharva by those that are conversant with the Vedas. The wise have said this, O king, to be the practice of the Asuras, viz., wedding a girl after purchasing her at a high cost and after gratifying the cupidity of her kinsmen. Slaying and cutting off the heads of weeping kinsmen, the bridegroom sometimes forcibly takes away the girl he would wed. Such wedding, O son, is called by the name of Rakshasa. Of these five (the Brahma, the Kshatra, the Gandharva, the Asura, and the Rakshasa), three are righteous, O Yudhishthira, and two are unrighteous. The Paisacha and the Asura forms should never be resorted to.[277] The Brahma, Kshatra, and Gandharva forms are righteous, O prince of men! Pure or mixed, these forms should be resorted to, without doubt. A Brahmana can take three wives. A Kshatriya can take two wives. As regards the Vaisya, he should take a wife from only his own order. The children born of these wives should all be regarded as equal.[278] Of the three wives of a Brahmana, she taken from his own order should be regarded as the foremost.