I have a question to ask. Does anyone know of any particular dua or surah to recite when visiting someone who is really ill?

I was just visiting my cousins grandad(not first cousin) who was diagnosed with cancer a while back and is now in critical situation. It was kinda scary watching him just lay there in his sleep and just keeping one eye on heart beat monitor.

It really brings you back to reality and makes you realize how temporary this life is and that we could die any minute.

The hardest thing is watching the relatives. You don't know what to say so everyone's just there in silence. Everyones emotions are really high at this moment yet you wanna remind them that this is all a test.