The Sunnah is to do things in odd numbers. These ayahs are ruqya and it is beneficial to recite them on people who need help as the Quran is a source of healing.

Shaykh I’ve often read scholars mention that certain surahs and ayahs of the Quran should be recited 3 times, 5 times or 7 times for ruqyah My question is that what is the significance of reciting them in those numbers and is there evidence for this from the Sunnah or is it something scholars have recommended out their wisdom?