Hadith 31-163

وَبِهذَا الإِسناد عَنْ عَلِىِّ بْنِ الحُسَيْن‏عَلَيْهِمَا السَّلاَمُ أَنَّهُ كانَ إِذا رَأى‏ المَرِيضَ قَدْ بَرِي‏ءَ مِنَ العِلَّةِ قالَ: يَهنِيكَ الطَّهُورُ مِنَ الذُّنُوبِ.

According to the same documentation, it is narrated that whenever Ali ibn Al-Husayn (a.s.) got well after being ill he (a.s.) said, “Enjoy getting cleansed from sins.”