Mahabharata Anushasna Parva Chapter 44:5

Mahabharata Anushasna Parva (Dana Dharma Parva) Chapter 44:5 Do thou remove these doubts of ours, for thou art endued with great wisdom and art honoured by the wise. Be thou the organ of vision unto ourselves that are desirous of learning the truth." Prince Satyavat answered saying, "The kinsmen of the maiden should bestow her upon him whom they consider eligible. There need be no scruples in this. The righteous act in this way without taking note of the giver of the dower even if he be alive; while, as regards the giver that is dead, there is not the slightest doubt. Some say that the virgin wife or widow,—one, that is, whose marriage has not been consummated with her husband by actual sexual congress in consequence of his absence or death,—may be allowed to unite herself with her husband's younger brother or such other relation. The husband dying before such consummation, the virgin-widow may either surrender herself to her husband's younger brother or betake herself to the practice of penances. In the opinion of some, the younger brother of the husband or such other relation may thus use the unused wife or widow, though others maintain that such practice, notwithstanding its prevalence, springs from desire instead of being a scriptural ordinance. They that say so are clearly of opinion that the father of a maiden has the right to bestow her upon any eligible person, disregarding the dowry previously given by another and accepted by himself. If after the hand of a maiden has been promised all the initial rites before marriage be performed, the maiden may still be bestowed upon a person other than the one unto whom she had been promised. Only the giver incurs the sin of falsehood: so far, however, as the status of wife is concerned, no injury can occur thereto. The Mantras in respect of marriage accomplish their object of bringing about the indissoluble union of marriage at the seventh step. The maiden becomes the wife of him unto whom the gift is actually made with water. The gift of maidens should be made in the following way. The wise know it for certain. A superior Brahmana should wed a maiden that is not unwilling, that belongs to a family equal to his own in purity or status, and that is given away by her brother. Such a girl should be wed in the presence of fire, with due rites, causing her, amongst other things, to circumambulate for the usual number of times.