"Fight those who believe not in Allah or the Last Day, nor hold that forbidden which hath been forbidden by Allah and His Messenger, nor acknowledge the religion of Truth, (even if they are) of the People of the Book, until they pay the jizya with willing submission, and feel themselves subdued." - Quran 9:29 (read more)

"And he [Muhammad] had their hands and feet cut off. Then he ordered for nails which were heated and passed over their eyes, and whey were left in the Harra (i.e. rocky land in Medina). They asked for water, and nobody provided them with water till they died (Abu Qilaba, a sub-narrator said, 'They committed murder and theft and fought against Allah and His Apostle, and spread evil in the land.')" - Sahih Bukhari 1:3:63 (read more)

"Due to the differences of both lives the Prophet (Sallallahu Alaihi wa Sallam) is not aware of what is going on in this world. He does not know who is asking help from him, and who is seeking child, wealth, wife, etc. ... On the other hand, if it is said that the Prophet (Sallallahu Alaihi wa Sallam) is alive in his grave, it does not mean that his life is similar to the life of those who are living in this world. So, if one seeks his help asks something from him he commits Shirk (polytheism)." - IslamWeb