[Machine] The Prophet ﷺ used to sit by the head of the sick person and say seven times, "I ask Allah the Mighty, the Lord of the Great Throne, to heal you. If it is in His destined time, may you be relieved from your pain."  

كَانَ النَّبِيُّ ﷺ إِذَا عَادَ الْمَرِيضَ جَلَسَ عِنْدَ رَأْسِهِ ثُمَّ قَالَ سَبْعَ مَرَّاتٍ «أَسْأَلُ اللهَ الْعَظِيمَ رَبَّ الْعَرْشِ الْعَظِيمَ أَنْ يَشْفِيَكَ فَإِنْ كَانَ فِي أَجَلِهِ تَأْخِيرٌ عُوفِيَ مِنْ وَجَعِهِ ذَلِكَ»  

The Prophet ﷺ said: If anyone visits a sick whose time (of death) has not come, and says with him seven times: I ask Allah, the Mighty, the Lord of the mighty Throne, to cure you, Allah will cure him from that disease. (Using translation from Abū Dāʾūd 3106)   

قَالَ رَسُولُ اللهِ ﷺ مَا مِنْ مُسْلِمٍ يَدْخُلُ عَلَى مَرِيضٍ لَمْ يَحْضُرْ أَجَلُهُ فَيَقُولُ أَسْأَلُ اللهَ الْعَظِيمَ رَبَّ الْعَرْشِ الْعَظِيمَ أَنْ يَشْفِيَكَ سَبْعَ مَرَّاتٍ إِلَّا عَافَاهُ اللهُ