And when the bearer of good tidings1 arrived, he cast it over his face, and he returned [once again] seeing. He said, "Did I not tell you that I know from Allāh that which you do not know?"
Translation: Saheeh International (English)
1 He who carried Joseph's shirt from among the brothers.
So when the person bearing news came with what would delight Jacob, he lay Joseph’s shirt over his face, and he became able to see again. Then he asked his sons if he had not said to them that he knew about the kindness and grace of Allah in a way that they did not know.