Tobias uses the gall to cure Tobit 's blindness , and the stranger reveals himself as the angel Raphael .
This enables Tobias to wed Sara without being killed , and they return to Nineveh .
Tobias uses the gall to cure Tobias 's blindness , and the stranger reveals himself as the angel Raphael .
This enables Tobias to wed Sara without being killed , and they return to Nineveh .