Last Testament of Abu Bakr
This is the testament of Abubeker Ebn Abu Kohafa, which he made at that time when he was just going out of this world, and entering into the other; a time in which the infidel shall believe, and the wicked person shall be assured, and the liar shall speak truth.
I appoint Omar Ebn Al Khattab my successor over you; therefore hearken to him, and obey him. If he does that which is right and just, it is what I think and know of him. If he does otherwise, every man must be rewarded according to his works. I intend to do for the best, but I do not know hidden things; but those who do evil shall find the consequences of it. Fare ye well, and the mercy and blessing of God be upon you.