Tobit 7:11
10 But Raguel overheard it and said to the lad, "Eat and drink, and be merry tonight. For no one except you, brother, has the right to marry my daughter Sarah. Likewise I am not at liberty to give her to any other man than yourself, because you are my nearest relative. But let me explain to you the true situation more fully, my child. 11 I have given her to seven men of our kinsmen, and all died on the night when they went in to her. But now, my child, eat and drink, and the Lord will act on behalf of you both." But Tobias said, "I will neither eat nor drink anything until you settle the things that pertain to me." So Raguel said, "I will do so. She is given to you in accordance with the decree in the book of Moses, and it has been decreed from heaven that she be given to you. Take your kinswoman; from now on you are her brother and she is your sister. She is given to you from today and forever. May the Lord of heaven, my child, guide and prosper you both this night and grant you mercy and peace."
Ambrose On the Duty of the Clergy 3.16
96 Tobit also clearly portrayed in his life true virtue, when he left the feast and buried the dead, and invited the needy to the meals at his own poor table. And Raguel is a still brighter example. For he, in his regard for virtue, when asked to give his daughter in marriage, was not silent regarding his daughter's faults, for fear of seeming to get the better of the suitor by silence. So when Tobit the son of Tobias asked that his daughter might be given him, he answered that, according to the law, she ought to be given him as near of kin, but that he had already given her to six men, and all of them were dead. This just man, then, feared more for others than for himself, and wished rather that his daughter should remain unmarried than that others should run risks in consequence of their union with her.
Notes and References
"... It comes as no surprise that Tobit was a popular text in early Christian thought. Some texts in Tobit were quoted quite often by many early Christian writers. For instance, the negative version of the golden rule in Tobit 4:15, ‘And what you hate, do not to anyone’, was quite popular in early Christian discourse. The text is very similar to Didache 1:2: ‘And whatever you do not want to happen to you, do not do to another’ ... Tertullian, Clement of Alexandria, Didymus of Alexandria, Origen, Ambrose, Ambrosiaster and Gregory of Nazianzus, refer multiple times to this text in Tobit. And although this study focuses on Greek and Latin Christian authors from the 2nd to the 5th century, Tobit was also known to Syriac Christian authors of late antiquity, such as Ephrem of Nisibis (306–373 CE) and the 4th-century Syriac Liber graduum ..."
de Wet, Chris L. The Book of Tobit in Early Christianity: Greek and Latin Interpretations from the 2nd to the 5th Century CE (pp. 1-13) HTS Teologiese Studies Vol. 76, No. 4, 2020