In Religion
Number Forty is a special number in the religious and Islamic culture.
The significance of the age of forty is undeniable, as Prophet Muhammad said, “When one gets forty God tells his two guardian angels, ‘From now on, be strict on him and note every small and big deed he does.’” This shows that one’s personality is formed before he becomes forty years old and every inner change will become harder after that.
In Mysticism
Muslim scholars, especially mystics, consider forty as a significant number in the fields of self-purification, finding one’s talents, and reaching moral heights.