"While we were one day sitting with the Messenger of Allah, sallallahu 'alayhi wasallam, there appeared before us a man dressed in extremely white clothes and with very black hair. No traces of journeying were visible on him, and none of us knew him. He sat down close by the Prophet, sallallahu 'alayhi wasallam, rested his knee against his thighs, and said, O Muhammad! Inform me about Islam."
It is reported on the authority of Abu Huraira:
We were sitting around the Messenger of Allah (may peace and blessings be upon him). Abu Bakr and Umar were also there among the audience. In the meanwhile the Messenger of Allah got up and left us, He delayed in coming back to us, which caused anxiety that he might be attacked by some enemy when we were not with him;
On the authority of Abu Dharr al-Ghifaree (may Allah be pleased with him) from the Prophet (peace and blessings of Allah be upon him) from his Lord, that He said:
O My servants! I have forbidden dhulm (oppression) for Myself, and I have made it forbidden amongst you, so do not oppress one another. O My servants, all of you are astray except those whom I have guided, so seek guidance from Me and I shall guide you.