When a man complained of pain the Prophet ﷺ said to him pointing to his saliva and mixing it with dust :(This is) the dust of our earth, mixed with saliva of us, so that our sick is remedied with the permission of our lord.
كَانَ النَّبِيُّ ﷺ يَقُولُ لِلإِنْسَانِ إِذَا اشْتَكَى يَقُولُ بِرِيقِهِ ثُمَّ قَالَ بِهِ فِي التُّرَابِ تُرْبَةُ أَرْضِنَا بِرِيقَةِ بَعْضِنَا يُشْفَى سَقِيمُنَا بِإِذْنِ رَبِّنَا