Its the sayings of Prophet Mohammad(Peace be upon him)
The Holy Bible is inspired directly from God and it helps all people to know how God wants us to live our lives. The scripture of the Islamic religion is the Koran and the Haddith.
Muhammad's mother was Amenah Bent Wahab and identity of his real father is not known. Abdullah was known to be his father. Some haddith suggest Abd-Al-Mutaleb as the actual father of Muhammad. Ref: The Book of Al Sirah Al-Halabia, VI page 128; Al-Tabaqat Al-Kubra, Printing 1, 1968, VI, page 95/96
Mohammed claimed in the haddith that he was possessed some of the time by God and other times possessed by the devil. He must have been possessed by the devil when he told people to kill others in the later part of the koran.It is the only explanation because it is wrong to kill people.
Many religious scholars would freely state that both the Jewish Tanakh and the Christian Holy Bible are the inspired word of God recorded over approximately 2000 years by various writers. Many of these same scholars fail to accept the teachings from the Muslim Koran and Haddith, written well after the completion of both other books (circa 7th Century AD) as the same, though Muslims would fully disagree. Then there are those scholars who would point out that each of these 3 religious books point to 'One God,' and how each is descendent (physically and/or spiritually) from Abraham. Also, many Jews and Muslims recognize the historical Jesus as a 'Prophet' from God. Jews do not recognize Him as the Messiah (still to come) and Muslims see Mohammed as the last and greater Prophet.