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"I would say to him 'I love him as a person'," Farid Ahmad told AFP. "I could not accept what he did. What he did was a wrong thing."

Asked if he forgave the 28-year-old white supremacist suspect, he said: "Of course. The best thing is forgiveness, generosity, loving and caring, positivity."

Husna Ahmad, 44, was killed at the Al Noor mosque -- the first of two targeted by the gunman.

Fifty people, at least four of them women, were killed in the attack on the mosques where worshippers had gone for Friday prayers.

Ahmad and his wife emigrated from Bangladesh to New Zealand in 1990 and have one daughter.

When the shooting started, Husna helped several people escape from the women's and children's hall.

"She was screaming 'come this way, hurry up', and she took many children and ladies towards a safe garden," Ahmad said.

"Then she was coming back for checking about me, because I was in a wheelchair, and as she was approaching the gate she was shot. She was busy saving lives, forgetting about herself."

Ahmad, 59, who has been confined to a wheelchair since being hit by a drunk driver in 1998, believes he escaped the hail of bullets because the gunman was focused on other targets.

"This guy was shooting one person two, three times, probably that gave some time to us to move out... even the dead he was shooting them again."

Ahmad, who was a butcher but now sells homeopathy products, did not see his wife when he left the mosque and only learned of her death after someone photographed her body.

"Her picture was out in the social media, so somebody showed me the picture and I identified quite easily."

Australian suspect Brenton Tarrant has yet to enter a plea in the single murder charge brought against him so far.

A self-professed white supremacist he flashed a white power symbol when he arrived in court on Sunday. His meandering "manifesto" is filled with racist vitriol, detailing two years of planning for the massacre.

In the 74-page screed, he says he first began considering an attack in April and May of 2017 while travelling in France and elsewhere in Western Europe.

Ahmad on Sunday faced the difficult task of formally identifying his wife's body and claim her effects.

Soft spoken, his eyes heavy with grief, he spoke fondly of his wife.

If he were able to sit down with the suspected mass murderer, he said he would encourage him to rethink his outlook on life.

"I will tell him that inside him he has great potential to be a generous person, to be a kind person, to be a person who would save people, save humanity rather than destroy them," he said.

"I want him to look for that positive attitude in him, and I hope and I pray for him he would be a great civilian one day. I don't have any grudge."