Give a copy of the Quran to someone. Each time one reads from it, you gain.
Place watercooler in a public place.
Donate a wheelchair to the hospital. Each time a sick person uses it, you gain.
Participate in building a masjid.
Plant a tree. Whenever a person or animal eats from it or sits in its shade, you gain.
And the easiest way of all, share this beautiful message with peoples. Even one applies any of the above methods, you gain.
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