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God said -
Say [O Prophet, to mankind]: If you love God follow me: God will love you and forgive you your sins...Q 3:31
Whoever obeys the Messenger obeys God...Q. 4:80
Say [O Muhammad]: O mankind! Verily, I am an apostle of God to all of you, [sent by Him] unto whom the dominion over the heavens and the earth belongs! There is no deity save Him; He alone grants life and death!...Q. 7:158
(Each of the previous prophets was sent to his and only his community. Thus the Old Testament only addresses the Children of Israel. Even Jesus speaks of himself as "sent only to the lost sheep of the house of Israel" (Mathew 15, 24). In contrast, the message of the Qur'an is universal - ie. addressed to human beings as a whole - and it is neither time-bound nor confined to any cultural environment. It is for this reason that Muhammad through whom this message was revealed, is described in the Qur'an as an evidence of God's "grace towards all the worlds" (21:107) and as the "Seal of the Prophets" (33:40) - in other words the last of them.)
Prophet said
1. None among you can be a believer until I become dearer to him than hs father and his child and all of mankind.
- H. Bukhari and Muslim. N. Anas
2. He who obeyed me obeyed GOd, and he who disobeyed me disobeyed God.
- H. Bukhari N. Abu Hurairah