In this way ages passed by and times rolled on, fathers passed away while sons took their places till Allah deputised Muhammmad (peace be upon him and his progeny) as His Prophet, in fulfilment of His promise and in completion of His Prophethood. His pledge had been taken from the Prophets, his traits of character were well reputed and his birth was honourable. The people of the earth at this time were divided in different parties, their aims were separate and ways were diverse. They either likened Allah with His creation or twisted His Names or turned to else than Him. Through Muhammmad (p.b.u.h.a.h.p.) Allah guided them out of wrong and with his efforts took them out of ignorance.
Then Allah chose for Muhammmad, peace be upon him and on his progeny, to meet Him, selected him for His own nearness, regarded him too dignified to remain in this world and decided to remove him from this place of trial. So He drew him towards Himself with honour. Allah may shower His blessing on him, and his progeny.
source : http://www.al-islam.org
