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  • The_Foundations_of_the_Islamic_Belief, page : 216

Sacred
Mosque in security if Allah wills, with hair shaven or cut short and without fear." (Quran
48:27) although
He had known that they were undoubtedly going to enter it and that He had willed their entrance.

What Allah instructed the Prophet - the praise and peace be upon him - in the use of the qualifying
formula. Consequently the Prophet - the praise and peace be upon him - learned the lesson and showed
his courtesy by the use of that formula in connection with everything he had said -whether that
thing
was known with certainty or doubtful; so that when he entered the cemetery, he said, "Peace be upon
you, the believing inmates of this abode. Indeed, if it is the Will of Allah, we shall follow you."
This he
said, not- withstanding the fact that death is not subject to any doubt, because courtesy demands
that
Allah is always remembered and that all things are made dependent upon Him.

This formula indicates such a thing and has become, by virtue of its common use, representative of
the
expression of desires and wishes.