“O Prophet, indeed We have sent you as a witness and a bringer of good tidings and a warner. and as the one who calls (people) towards Allah with His permission, and as a luminous lamp.” (Quran 33:45-46)
Muhammad (صَلَّى ٱللّٰهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ) is the final messenger of Allah (سُبْحَانَهُ وَتَعَالَى). He was blessed with Allah's (سُبْحَانَهُ وَتَعَالَى) final revealed book, the Quran. Muhammad (صَلَّى ٱللّٰهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ) was both the warner of the punishment in Hell and the bearer of glad tidings of the Paradise.
Muhammad's (صَلَّى ٱللّٰهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ) led a life of perfection which the Muslims try to emulate. He was such a truthful and honest person that even his enemies would entrust him with their belongings. He was a kind and compassionate towards all forms of life. For all human beings, he presented perfect life examples, for example, how to be a husband, a father, a trader, a preacher, a charitable person, a statesman, etc. During his own lifetime, he was able to establish a state based on the Islamic principles.
A compilation of Muhammad's (صَلَّى ٱللّٰهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ) sayings and teachings (called the hadith) in Arabic and English languages can be found here: