What to say to the sick
Ibn ‘Abbas (radi Allahu anhu) reported: The Prophet (sal Allahu alaihi wa sallam) visited a bedouin who was sick. Whenever he visited an ailing person, he would say, “La ba’sa, tahurun insha’Allah [No harm, (it will be a) purification (from sins), if Allah wills].”
We benefit from the above Hadith that we should remind the sick person by saying to him, “La ba’sa, tahurun in sha’ Allah [No harm, (it will be a) purification (from sins), if Allah wills]”
This reminds the sick person that any sickness that they suffer and are is patient, Allah will wipe away some of their sins due to the sickness they went through patiently whilst also anticipating to be rewarded by Allah.
And Allah knows best!