Tobit 6:17

17 When you enter the bridal chamber, take some of the fish's liver and heart, and put them on the embers of the incense. An odor will be given off;

Tobit 6:17 In-Context

15 It does not harm her, but it kills anyone who desires to approach her. So now, since I am the only son my father has, I am afraid that I may die and bring my father's and mother's life down to their grave, grieving for me—and they have no other son to bury them."

16 But Raphael said to him, "Do you not remember your father's orders when he commanded you to take a wife from your father's house? Now listen to me, brother, and say no more about this demon. Take her. I know that this very night she will be given to you in marriage.

17 When you enter the bridal chamber, take some of the fish's liver and heart, and put them on the embers of the incense. An odor will be given off;

18 the demon will smell it and flee, and will never be seen near her any more. Now when you are about to go to bed with her, both of you must first stand up and pray, imploring the Lord of heaven that mercy and safety may be granted to you. Do not be afraid, for she was set apart for you before the world was made. You will save her, and she will go with you. I presume that you will have children by her, and they will be as brothers to you. Now say no more!" When Tobias heard the words of Raphael and learned that she was his kinswoman, related through his father's lineage, he loved her very much, and his heart was drawn to her.