The Message of Prophet Muhammad (Sallallahu alaihi wa sallam)

 Message of truthfulness

The unparalleled life of the Holy Prophet (Sallallahu alaihi wa sallam), His truthfulness and His trustworthiness were accepted even by non-Muslims.  He always spoke the truth.  There would be nothing false in His talk.  He is the epitome of truth.  There is a Hadith in Mustadrak ‘Alas Sahihain:

Translation: Hadhrat ‘Ali (May Allah be well pleased with him) says:  Abu Jahl told the Holy Prophet (Sallallahu alaihi wa sallam)!  We know without doubt that you maintain relations and speak the truth.  (Mustadrak ‘Alas Sahihain, Hadith No. 3187)

The character and the morals of the Holy Prophet (Sallallahu alaihi wa sallam) were so high that the disbelievers would also accept it.  Thus, when He stood on the mountain of Safa and called out to the Quraish, they all gathered.  The Holy Prophet (Sallallahu alaihi wa sallam) asked them:

Translation: Tell me!  If I inform you that behind this valley lies an army which is going to attack you, will you acknowledge what I say?  They said:  Yes!  We have always seen you speaking the truth.  (Sahih Bukhari, Hadith No. 4770)