Chabad of Bondi Rabbi Yehoram Ulman, whose son-in-law Rabbi Eli Schlanger was killed in the December attack, gave an emotional address to the Royal Commission into Anti-Semitism and Social Cohesion in Sydney on Wednesday.
He spoke about presiding over 10 funerals in three days after the attack.
"We couldn't bring back those we had lost or removed the grief from the families whose lives had been shattered," he said.
Rabbi Ulman said the royal commission had been deeply important to delivering a brighter future for the nation.
"My prayer is when my grandson is old enough to understand what happened to his father, he will also be able to understand what Australia chose to do about it, and he will be proud of the choice you made," he said.
Throughout the hearings, which began in May, the commission heard from almost 350 witnesses and received around 20,000 written submissions.
Commissioner Virginia Bell said the inquiry's final report would be handed down on December 18, rather than December 14.
The short extension was in response to concern from Australia's Jewish community that the report coming out on the day of the anniversary of the attack would be a distraction from memorials.
She acknowledged frustration from the community that the commission did not appear to outwardly investigate the events leading to the attack, but said closed hearings had been held to avoid prejudicing ongoing criminal proceedings related to the attack.
The findings from those hearings and other classified evidence would be in a confidential volume of the final report, Ms Bell said.
The granddaughter of Eddie Jaku, another Holocaust survivor who wrote a bestselling memoir about surviving several German concentration camps during World War II before settling in Australia, also spoke at the probe on Wednesday.
Danielle Jaku told the commission incidents since her grandfather's death - including a protest at the Sydney Opera House on October 9, 2023 - would have reminded him of tropes and imagery used during his childhood in Germany.
"If he was here, he would be the most haunted man on earth," Ms Jaku said.
The commission was also addressed by the founder of Sikh-led charity Turbans 4 Australia, which provided support and food relief at Bondi following December's terrorist attack.
Amar Singh said the relief effort reflected Australia's best.
"When we head out to those disaster zones ... our trucks and vans also bring out hope and gratitude," he said.
The commissioner addressed the evidence of a former spy who has publicly claimed he warned ASIO about the father-son duo responsible for the massacre six years before they shot 15 people dead at Bondi.
The spy has lived in hiding overseas since 2023 after ASIO withdrew its support for his permanent residence, hindering a bid by the commission to hear his evidence.
But Ms Bell said the spy - whose application for a visa to return to Australia was rejected - had been offered the chance to give evidence remotely from overseas, but declined as it did not allow him certain legal protections.
Giving evidence publicly could prejudice ongoing legal proceedings about the two shooters, she said.
The commission accessed reports the spy provided to ASIO at the time, Ms Bell said.
Leaders of Australia's Jewish community expressed gratitude for those who gave evidence at the commission, often at a personal cost.
The commission heard directly from around 14,000 members of the community through evidence given in person and in writing.
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