Short answer

Many things he foretold came true. The Prophet Muhammad (ﷺ) spoke them in Medina, when many Muslims were poor and the roads of Arabia were unsafe. He told Adi ibn Hatim that a woman would one day travel from Iraq to the Ka'ba fearing no one but Allah (﷾). He added that the treasures of the Persian emperor would be opened. Adi lived to see both. The Prophet (ﷺ) also said that Allah (﷾) might make peace between two groups of Muslims through his little grandson al-Hasan. About thirty years after the Prophet (ﷺ) died, al-Hasan did exactly that. He also foretold the conquest of Egypt and Jerusalem. The Bible tests a prophet by whether his words come true, and whether he calls people to the one God (﷾). He passes both. So Islam's answer is that he spoke by revelation from Allah (﷾).

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