Even acts of pure worship in the shar` (Allah’s law) have [deep] purposes, and for this reason the Quran mentions the reasons behind these acts, for example the salah “restrains from shameful and unjust deeds” [Quran 29:45] and the zakah “to cleanse them and purify them thereby” [Quran 9:103] and siyam [fasting] “to acquire fear and mindfulness of God” [Quran 2:183] and the haj [pilgrimage to Makkah] “so that they might experience much that shall be of benefit to them, and that they might extol the name of God” [Quran 22:28]