Riyad as-Salihin

Ibn 'Abbas (May Allah be pleased with them) reported: The Prophet (ﷺ) visited a bedouin who was sick. Whenever he visited an ailing person, he would say, "La ba'sa, tahurun in sha' Allah [No harm, (it will be a) purification (from sins), if Allah wills]."

[Al-Bukhari].