"The concern about my safety is always there," he told the BBC in an exclusive interview as he tucked into his first meal as a free man.

Nigeria is a deeply religious society and those who may be seen as having insulted a religion - whether Islam or Christianity – face being shunned and discriminated against.

Blasphemy is an offence under Islamic law – Sharia - which operates alongside secular law in 12 states in the north. It is also an offence under Nigeria's criminal law.