If you fear scorpion or any other arachnid, you may say this supplication, which Imam al-Baqir (a.s.) has guaranteed for anyone who says it safety from stings of scorpions or any pests up to the next morning:
اَعُوْذُ بِكَلِمَاتِ اللّٰهِ التَّامَّاتِ
I seek protection of the Perfect Words of Allah
الَّتِىْ لَايُجَاوِزُ هُنَّ بَرُّ وَلَا فَاجِرٌ
that neither dutiful nor sinful one can surpass
مِّنْ شَرِّ مَاذَرَءَ
against the evil of whatever He has originated,
وَمِنْ شَرِّ مَا بَرَءَ
the evil of whatever He has created,
وَ مِنْ شَرِّ كُلِّ دَآبَّةٍ هُوَ اٰخِذٌ بِنَاصِيَتِهَا
and the evil of every living creature that He holds it by its forelock.
اِنَّ رَبِّىْ عَلٰى صِرَاطٍ مُّسْتَقِيْمٍ۔
Surely, my Lord is on the right path.
