Abul Aswad narrates the following: Hazrat Zubair (radhiyallahu ‘anhu) had accepted Islam at the age of eight, and made hijrah at the age of eighteen. His uncle would suspend him in a pen and would light a fire so that he would suffer from the smoke. His uncle would then command him to abandon Islam, to which he would reply, “I will never become a Kaafir!”
(Tahzeeb-ul-Kamaal 9/321)
Hijrah
Hazrat Zubair (radhiyallahu ‘anhu) was among those Sahaabah (radhiyallahu ‘anhum) who made Hijrah to Abyssinia to escape the persecution of the Quraish. However, he did not remain long in Abyssinia.
(Siyar A’laam min Nubalaa 3/30)
Source: Whatisislam.co.za