Lord Jesus said: “15 “Beware of false prophets, who come to you in sheep’s clothing but inwardly are ravenous wolves. 16 You will recognize them by their fruits. Are grapes gathered from thornbushes, or figs from thistles? 17 So, every healthy tree bears good fruit, but the diseased tree bears bad fruit. 18 A healthy tree cannot bear bad fruit, nor can a diseased tree bear good fruit. 19 Every tree that does not bear good fruit is cut down and thrown into the fire. 20 Thus you will recognize them by their fruits.”
How it would be if he have both good and bad fruits? Is it impossible?
On the other hand, Muhammad had some good fruits: He rejected paganism and expunged it in Arabia, He stopped Female baby killing which was conventional between arabs, He teached that Jesus is the Messiah, He teached that God is one,… So is he a true prophet according to Matthew7:18?