We relate in the Ṣaḥīḥs of al-Bukhārī and Muslim, the Sunan of Abū Dāwūd and other sources, from ‘Ā’ishah who said that when any man became sick, was wounded or had a sore, the Prophet put his finger like this (here Sufyān ibn ‘Uyaynah, the narrator, put his index finger on the ground) and then raised it saying: “In the name of Allah, the dust of our earth by the saliva of one of us, our sick will be cured, by permission of our Lord.” [2].
who said that when any man became sick, was wounded or had a sore, the Prophet 
put his finger like this (here Sufyān ibn ‘Uyaynah, the narrator, put his index finger on the ground) and then raised it saying: “In the name of Allah, the dust of our earth by the saliva of one of us, our sick will be cured, by permission of our Lord.” [2].