'A'isha (May Allah be pleased with her) reported:

When any person fell ill with a disease or he had any ailment or he had any injury, the Prophet ﷺ placed his forefinger upon the ground and then lifted it (Sufyan bin `Uyainah, the narrator, demonstrated this with his forefinger) by reciting the name of Allah. (and said): "The dust of our ground with the saliva of any one of us would serve as a means whereby our illness would be cured with the sanction of Allah."

[Al-Bukhari and Muslim].

عَنْ عَائِشَةَ، أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ إِذَا اشْتَكَى الإِنْسَانُ الشَّىْءَ مِنْهُ أَوْ كَانَتْ بِهِ قَرْحَةٌ أَوْ جَرْحٌ قَالَ النَّبِيُّ ﷺ بِإِصْبَعِهِ هَكَذَا وَوَضَعَ سُفْيَانُ سَبَّابَتَهُ بِالأَرْضِ ثُمَّ رَفَعَهَا " بِاسْمِ اللَّهِ تُرْبَةُ أَرْضِنَا بِرِيقَةِ بَعْضِنَا لِيُشْفَى بِهِ سَقِيمُنَا بِإِذْنِ رَبِّنَا " ((متفق عليه))