لَا بَأْسَ طَهُورٌ إِنْ شَاءَ اللَّهُ

Laa ba'sa tahoorun 'inshaa'Allah.

Do not worry, it will be a purification (for you), Allah willing. The Prophet (ﷺ) used to say this dua when he went to see a sick person.

Reference: Bukhari: 3616