Sa‘d said

When I was ill the Prophet (ﷺ) came to visit me, and putting his hand between my nipples so that I felt its coolness on my heart, he said, “You are suffering from a heart disease. Go to al-Harith b. Kalada who belongs to Thaqif, for he practices medicine, and get him to take seven of the 'ajwa dates of Medina and pound them together with their stones, then administer them to you.” Abu Dawud transmitted it.