Prayer to be Recited Seven Times When Visiting the Sick
Healing PrayersFrom the section 'Prayers to be Recited on Various Occasions' in the book 'Prayers and Dhikr' by Mahmud Sami Ramazanoğlu - 'Prayers for Healing' part
If a believer visits a sick person... and says seven times: “I ask Allah, the Great, the Lord of the Great Throne, to grant you healing!”, he will surely recover. (Abu Dawud, Janaiz, 8; Tirmidhi, Tibb, 32)