Proofs that Muhammad (ﷺ) is a true Prophet

Muhammad the son of 'Abdullah (PBUH) is Allah's Messenger in reality and truth, for the evidences that show his veracity are abundant. 

 The first evidence: 

  First of all, his noble character stood him out as the most impeccable one ever. In point of truth, he proved by his living example that he was the most truthful and honest person of his age. All the people of Makkah, without any exception, swore to his truthfulness and honesty for he had lived an unblemished and extremely pious life among them for forty years. 

It was reported in Sahih Al-Bukhari that the chief infidels of the Quraysh said to him: “we have never heard you telling a lie."                        

 So honesty is proof enough of the Prophet's truthfulness. Quite simply, a claimant of prophethood is either the most honest of people—to be chosen by God to convey His Message—or the most dishonest of people because none is more unjust than one who lies about Allah falsely claiming that He sent him as a Prophet.

 In fact, only the most ignorant of people cannot make the distinction between the most honest of people and the biggest liars. 

In fact, Abu Bakr as-Siddiq, Khadija and the companions, embraced Islam before witnessing the Prophet’s miracles i.e. the splitting of the moon, heralding the unseen and the challenge of the Qur’an. 

As a matter of fact they did not need to witness the miracles of Prophet Muhammad (PBUH) to believe because they were aware of his veracity and thus needed no further signs. 

Likewise, when the Prophet ran to his wife Khadija (RA) for comfort after the momentous event of revelation she told him in reassurance: “never! by God, God will never disgrace you” and when she took him to her cousin Waraqa ibn Nawfal,  a learned Christian, he too reassured them saying: “this is the Keeper of Secrets (Gabriel) whom Allah had sent to Moses.” 

Moreover, when Abu Bakr was invited to Islam by the Prophet he accepted without hesitation or reservations. Similarly, when the Prophet’s letter was read to King Al-Najashi (Negus) he declared his belief in Islam saying: “He is the illiterate Prophet that the Jews and the Christians have been waiting for.” 

To sum up, all the aforementioned figures believed the Prophet (PBUH) right away owing to his truthfulness and honesty. As we have mentioned earlier, even the infidels admitted that they have never known him to tell a lie.

As a matter of fact, God blamed the infidels of the Quraysh for denying Muhammad’s prophethood because they of all people knew that he was a perfect example of being upright. 

Indeed, they used to call him 'as-Sadiq' (the Truthful) and 'al-Amin' (the Honest). God says: Or is it that they did not recognize their Messenger (Muhammad) so they deny him? (The Qura'n, 23:69)

The Last Prophet   Evidences for the Authenticity of Islam; P 35

   Dr. Haitham Talaat. 

  Translated by Sabah Temmar B. A’mar.