Reference : Hisn al-Muslim 147

لا بأْسَ طَهـورٌ إِنْ شـاءَ الله
Lā ba'sa ṭahūrun in shā Allāh.

Do not worry, it will be a purification (for you), Allah willing.

Reference:
Al-Bukhari, cf. Al-Asqalani Fathul-Bari 10/118.

Chapter: When visiting the sick