What to say when you feel a pain in your body

Bismillaah.

With the Name of Allah (three times).

Then say :

'A'oothu billaahi wa qudratihi min sharri maa 'ajidu wa 'uhaathiru.

I seek refuge in Allah and in His Power from the evil of what I find and of what I guard against.

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Reference: Muslim 4/1728.