Khabbab was from the Banu Tamim clan in Najd. The Brotherhood was made b/w him and Jabr/Jabir bin 'Atik b. Qays
Before Muhammad started his mission and Khabbab was "obviously not yet in his teens", one of the Arab tribes raided their territory and took their cattle and captured women and children. Khabbab was among the youths captured. He was passed from one hand to another until he ended up in Makkah, in the slave market of that city. A woman named Umm Anmaar who belonged to the Banu Khuza'a clan of the Quraish tribe in Mecca went there. She wanted to buy herself a youth for her domestic chores and to exploit his labour for economic gains. As she scrutinized the faces of those who were displayed for sale, her eyes fell on Khabbab. She saw that he was strong and healthy and that there were clear signs of intelligence on his face. She needed no further incentive to purchase him. She paid and walked away with her new slave. On the way home, Umm Anmaar and Khabbab had a conversation where Khabbab explained his background. Umm Anmaar placed the young Khabbab as an apprentice to one of the blacksmiths in Makkah to learn the art of making swords. Khabbab learnt quickly and was soon an expert at the craft. When he was strong enough, Umm Anmaar set up a workshop for him with all the necessary tools and equipment for making swords. Soon he was quite famous in Makkah for his excellent craftsmanship. People also liked dealing with him because of his honesty and integrity. Umm Anmaar gained much profit through him and exploited his talents to the full.
Khabbab did not hide his acceptance of Islam from anyone and when the news of his becoming a Muslim reached Umm Anmaar, she became incensed with anger. She went to her brother Siba'a ibn Abd al-Uzza who gathered a gang of youths from the Banu Khuza'a and together they made their way to Khabbab. They found him completely engrossed in his work. Siba'a went up to him and said: "We have heard some news from you which we don't believe." "What is it?" asked Khabbab. "We have been told that you have given up your religion and that you now follow that man from the Banu Hashim ." I have not given up my religion," replied Khabbab calmly. "I only believe in One God Who has no partner. I reject your idols and I believe that Muhammad is the servant of God and His messenger." As soon as he spoke these words did Siba'a and his gang set upon him. They beat him with their fists and with iron bars and they kicked him until he fell unconscious to the ground, with blood streaming from the wounds he received.