Dua for healing the sick

Whenever Messenger of Allah ﷺ paid a visit to a patient, or a patient was brought to him, he used to invoke Allah, saying, 

adhhibi al-baʾsa, rabb al-nās, ishfi wa-anta al-shāfī, lā shifāʾa illā shifāʾuka, shifāʾan lā yughādiru saqaman

"Take away the disease, O the Lord of the people! Cure him as You are the One Who cures. There is no cure but Yours, a cure that leaves no disease."

أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ إِذَا أَتَى مَرِيضًا أَوْ أُتِيَ بِهِ قَالَ: 

«أَذْهِبِ الْبَاسَ، رَبَّ النَّاسِ، اشْفِ وَأَنْتَ الشَّافِي، لَا شِفَاءَ إِلَّا شِفَاؤُكَ، شِفَاءً لَا يُغَادِرُ سَقَمًا».