Umar ibn al-Khattab brought to Allah's Messenger (peace be upon him) a copy of the Torah and said: Allah's Messenger, this is a copy of the Torah. He (Allah's Messenger) kept quiet and he (Umar) began to read it. The (colour) of the face of Allah's Messenger (peace be upon him) underwent a change, whereupon AbuBakr said: Would that your mother mourn you, don't you see the face of Allah's Messenger? Umar saw the face of Allah's Messenger (peace be upon him) and said: I seek refuge with Allah from the wrath of Allah and the wrath of His Messenger. We are well pleased with Allah as Lord, with Islam as religion, and with Muhammad as Prophet. Whereupon Allah's Messenger (peace be upon him) said: By Him in Whose hand is the life of Muhammad, even if Moses were to appear before you and you were to follow him, leaving me aside, you would certainly stray into error; for if (Moses) were alive (now), and he found my prophetical ministry, he would have definitely followed me.
Transmitted by Darimi.