"It's my duty as a Muslim brother to come to support and aid the families and victims of this tragedy.
"What happened was obviously very horrific and very bad and sad, as far as what went down, but God willing the good will come out of this."
Yesterday, he visited several survivors in hospital.
Hearing their stories, was "really emotional".
"Just being there and hearing what they had to go through… They are lucky to be here."
"The footage I saw… for them to live through that and to see dead bodies and see people being murdered, I wouldn't wish that upon my worst enemy."
Mundine paid tribute to Prime Minister Jacinda Ardern's leadership.
He said she's led from the front with compassion, empathy and class.
"She couldn't do anything more to show that respect and I take my hat off to her," he said.
"The whole world's leaders can really take a leaf out of her book. It's the first time I've seen a PM lead with her heart and do the right thing instead of being led a different way."
He hoped that the tragedy will help people learn and understand more about Islam.