Abu Dhar went to our Master Muhammad [s]. The Prophet [s] looked at him sorrowfully and then said to him kindly:
Go back to your people and invite them to Islam.
Abu Dhar said:
I'll go back to my people and I won't forget what the Quraish have done to me!
Abu Dhar came back to his tribe and began inviting them to the light of Islam. His brother Anees, his mother and a half of his tribe believed in Islam.
The second half of his tribe said:
We won't believe in Islam till the Prophet comes.