Blowing on liquids is OK. Doing that every day without a need for it is not permissible. If a person is in need of a ruqya and does this, this is permissible.

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Ruqyah in Islam is the recitation of Quran, seeking of refuge in Allah, remembrance and supplications that are used as a means of treating sicknesses and other problems.

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You should seek protection from Allah and seek refuge in Him from Satan. If you can, spit on your left 3 times and seek refuge in Allah 3 times. If there is someone to your left, do that under your left foot.

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  If there is evidence that support this, this is permissible to think in that way. However, without evidence, it is only speculations that have no value. He should ask Allah for forgiveness a lot and to say: la ilaha illa anta subhanaka inni conto mina athaalimeen.

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