The concept of Itmām al-hujjah requires that religious truth is presented by a Rasul (Messenger) and not by a mere Nabi (Prophet).
[3] The Qu'ran asserts that after Itmām al-hujjah has been attained, those rejecting the religious truth have no excuse and are punished by Allah.
[4] The Qur'an explains this punishment in the following verse:[5] And the disbelievers said to their Messengers: ‘‘We will drive you out of our land, or you return to our religion’’.
I will terminate [your period] and raise you to Myself and cleanse you from those who have denied you; I will make those who follow you superior to those who reject faith till the Day of Resurrection.
So there should be no point of misconception with the following verse: But when the forbidden months are past, then fight and slay the Pagans wherever ye find them, and seize them, beleaguer them, and lie in wait for them in every stratagem (of war); but if they repent, and establish regular prayers and practise regular charity, then open the way for them: for Allah is Oft-forgiving, Most Merciful.