Zubayr Ibn Awwam endures torture in the hands of his uncle, who was a Qurayshi polytheist. The crime that Zubayr committed was that he abandoned his polytheistic belief, and converted to Islam. The following are historical sources which mention the details on Zubayr Ibn Awwam.
Hilya – Abu Nu’aym (947 – 1038 AD):
“Abul Aswad narrates that Zubayr Ibn Awwam accepted Islam when he was only eight years of age and migrated (to Madinah) when he was eighteen years old. The uncle of Zubayr used to Hang him up in a straw mat and use a fire to make smoke from the bottom. He would then say, ‘Return to Kufr (disbelief)! ’ Zubayr used to say, ‘I shall never be a disbeliever again!’” (Hilya, by Abu Nu’aym volume 1, page 89; Haythami volume 9, page 151)
Mustadrak – al-Hakim al-Nishapuri (933 – 1012 AD):
“Zubayr Ibn Awwam was tortured by his uncle who would tie up a mat to him and set it smoking, saying, ‘Abandon the new religion.’ Zubayr would reply, ‘I shall never do that.’” (Mustadrak al-Haakim, volume 3, page 360)
Al-Isaba – Ibn Hajar al-Asqalani (1372 – 1449) :
“Al-Zubayr Ibn al-Awwam embraced Islam, his uncle arrested him and rolled him up in a mat and among other forms of torture, kept him upon intense heat and smoke in order to compel him to forsake his new faith. He bore all punishment with patience and did not give up his faith.” (Al-Isabah, by Ibn Hajar al-Asqalani, volume 1, page 545. No. 2789)
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 A different translation for the same report:
“When Zubair Ibn Awwam embraced Islam, his uncle wrapped him in a sack and subjected him to incessant palls of smoke. He left no stone unturned in an attempt to compel him to return to Kufr (disbelief) but Zubair Ibn Awwam would utter: ‘Never! I will certainly not regress to Kufr (disbelief).” (Al-Isabah, by Ibn Hajar al-Asqalani, volume 1, page 545)