‘Āishah (may Allah be pleased with her) reported: When someone complained of an ailment or had a sore or a wound, the Prophet (may Allah's peace and blessings be upon him) did this with his index finger – the narrator, Sufyān ibn ‘Uyaynah, touched the ground with his index finger and then raised it - and said: "In the name of Allah, the dust of our earth along with the saliva of some of us will cure our ailing people, with the permission of our Lord." Authentic hadith - Narrated by Bukhari & Muslim