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rusulan mubashshirīna wa-mundhirīna li-ʾallā yakūna li-n-nāsi ʿalā llāhi ḥujjatun baʿda r-rusuli wa-kāna llāhu ʿazīzan ḥakīman
apostles, as bearers of good news and warners, so that mankind may not have any argument against Allah, after the [sending of the] apostles; and Allah is all-mighty, all-wise.
— Ali Quli Qarai
Surah An-Nisa', Verse 165
165. "(We sent) messengers as givers of glad tidings and as warners, so that people might have no argument against Allah after the (invitations of) the messengers, and Allah is the Mighty, the Wise."
This verse expresses the words of prophets' invitation and the method of their effort, together with the purpose of the mission of prophets to prophet hood. The method of the work of prophets is based on two pivots: 'glad tidings' and 'warning'.
The philosophy of the mission of prophets is Allah's 'completing the argument' for humankind so that they cannot say that they had not any leader or guide. It is necessary to mention that from the point of personal epithets, background of life, social, political, genealogical, and physical situation, and also from the point of having miracles, clear statements, and being aided by hidden helps, prophets should be in a state that no one be able to object any things of theirs.
And, since 'Allah is the Mighty, the Wise', none has any proof against Him, as the Qur'an states:
Footnotes