In the document, which the right-wing terrorist, Brenton Harrison Tarrant, published online and emailed to New Zealand Prime Minister Jacinda Ardern minutes before the attack on Friday, he refers to Mandela as “a terrorist”.
“I do not expect to be released, but I also expect an eventual Nobel Peace prize - as was awarded to the terrorist Nelson Mandela once his own people achieved victory and took power,” Tarrant wrote.
“I expect to be freed in 27 years from my incarceration, the same number of years as Mandela, for the same crime.”
South Africa has joined a host of countries in condemning the attack.
Tarrant, 28, appeared in court on Friday and was charged with murder.
He did not apply for bail and his next court appearance is scheduled for 5 April.
In his manifesto, Tarrant accepts he is a racist and a fascist and described US President Donald Trump as “a symbol of renewed white identity and common purpose”.
He also claimed the attack on Friday was an act of revenge for Ebba Akerlund, the 11-year-old girl killed in the 2017 Stockholm terror attack.
Akerlund’s father condemned the Christchurch attacks.
Social media companies have since deleted the videos of the live-streamed attacks.
Department of International Relations and Co-operation spokesperson Ndivhuwo Mabaya said they were not aware of any South Africans who had been affected by the attacks, reports Sunday Tribune.