Hadith: Bismillāhi arqīk, min kulli shay’in yu’dhīk, min sharri kulli nafsin aw ‘aynin hāsidin, Allāhu yashfīk, bismillāhi arqīk (In the Name of Allah, I recite a prayer (Ruqyah) over you, from everything that harms you, from the evil of every soul or the eye of an envier. May Allah cure you. In the Name of Allah, I recite a prayer (Ruqyah) over you)

عَنْ أَبِي سَعِيدٍ رَضيَ اللهُ عنه:
أَنَّ جِبْرِيلَ أَتَى النَّبِيَّ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ، فَقَالَ: يَا مُحَمَّدُ اشْتَكَيْتَ؟ فَقَالَ: «نَعَمْ» قَالَ: «بِاسْمِ اللهِ أَرْقِيكَ، مِنْ كُلِّ شَيْءٍ يُؤْذِيكَ، مِنْ شَرِّ كُلِّ نَفْسٍ أَوْ عَيْنِ حَاسِدٍ، اللهُ يَشْفِيكَ بِاسْمِ اللهِ أَرْقِيكَ».
[صحيح] - [رواه مسلم] - [صحيح مسلم: 2186]

Abu Sa‘īd (may Allah be pleased with him) reported:
Gabriel came to the Prophet (may Allah's peace and blessings be upon him) and said: O Muhammad, have you fallen ill? He said: "Yes." So Gabriel said: " Bismillāhi arqīk, min kulli shay’in yu’dhīk, min sharri kulli nafsin aw ‘aynin hāsidin, Allāhu yashfīk, bismillāhi arqīk (In the Name of Allah, I recite a prayer (Ruqyah) over you, from everything that harms you, from the evil of every soul or the eye of an envier. May Allah cure you. In the Name of Allah, I recite a prayer (Ruqyah) over you)."
[Authentic hadith] - [Narrated by Muslim] - [Sahih Muslim - 2186]

Explanation

Angel Gabriel (peace be upon him) came to the Prophet (may Allah's peace and blessings be upon him) and asked him: O Muhammad, are you suffering from illness? He said: Yes. So Gabriel recited Ruqyah on the Prophet (may Allah's peace and blessings be upon him), saying: "In the Name of Allah" seeking His aid, "I recite Ruqyah over you" and seek refuge for you "from everything that harms you", whether small or big, "from the evil of every soul" that is malicious "or the eye of an envier" to afflict you, "may Allah cure you", guard you, and protect you from all diseases. "In the Name of Allah, I recite Ruqyah over you" is repeated for emphasis, and it begins and ends with it to signify that none can bring benefit or harm except Allah Almighty.

Benefits from the Hadith

1. It is permissible to inform others about one's illness as a way of stating the reality of one's condition, not out of complaint or resentment.
2. Ruqyah (faith healing) is permissible with the following conditions: 1. It must be done using the Qur’an, or the remembrance of Allah Almighty, and prescribed supplications. 2. It must be in Arabic or in another language whose meaning is known and understood. 3. One must believe that Ruqyah does not have any effect on its own, but that it is merely a means, and that its effectiveness is only by the permission of Allah Almighty. 4. It must be free from any form of Shirk (polytheism), prohibited practices, innovations, or anything that leads to them.
3. Affirmation of the harm caused by the evil eye, and that it is real, thus one should seek Ruqyah (spiritual protection) against it.
4. It is recommended to perform Ruqyah with the supplication mentioned in the Hadīth.
5. The Prophet (may Allah's peace and blessings be upon him), like other human beings, experienced what others experience, including illness.
6. Allah's care for His Prophet (may Allah's peace and blessings be upon him), His protection for him, and His appointing angels to guard him.