Muslim leaders fear incendiary comments from Pauline Hanson could fuel hatred and inspire violence against their communities.
The community is again on high alert after a threat letter was sent to Lakemba Mosque, the third it has received in a month.
Featuring a cartoon pig, the letter made calls to kill or deport Muslims and referenced an Australian convicted terrorist who killed 51 Muslims in Christchurch in 2019.
The threat was made just days after Senator Hanson made widely condemned comments saying there were "no good Muslims".
The letter appeared to echo her comments, reading "the only good muslim (sic) is a dead one".
Police are investigating the threat and have taken the letter for forensic examination.
Lebanese Muslim Association secretary Gamel Kheir pleaded for political leaders to take a stronger stance against the One Nation leader's language and prevent Islamophobia festering.
"This is classic dog-whistling," he told AAP.
"Now one person will take that dog-whistling a bit further, God forbid, and decide they're going to take it into their own hands, and then we've got a Christchurch on our hands.
"Have we learned nothing from Bondi, when the Jewish community said there had been a rise in anti-Semitism, and they were ignored?"
Prime Minister Anthony Albanese drew a line between the senator's rhetoric and others' violent threats towards Muslims.
"It legitimises it," he told ABC Radio Sydney.
"It mainstreams it."
Senator Hanson has been roundly condemned by other public figures including Usman Khawaja.
The recently retired Test cricketer said the comments create division and animosity towards nearly one million Australians.
"Imagine if she said this about people of Jewish faith," he said.
Senator Hanson, who was suspended from the Senate in 2025 for a burqa stunt, also referred to Lakemba and claimed without evidence that people would "feel unwelcome" in the southwest Sydney suburb.
That jars with an invitation from the local mayor Bilal El-Hayek for the senator to attend the popular Ramadan night markets, due to attract many thousands of people nightly for a month.
While not evident in the area early on Thursday afternoon, a high-visibility police operation was expected in Lakemba for evening prayers and the markets.
"There will be additional security measures in place, if for nothing else, to make people feel safer, feel better," local MP and state cabinet minister Jihad Dib said.
"I hope that we don't need it."
Social worker Jamal Saeed described the mosque as his second home after migrating from Ghana more than 15 years ago.
"We feel unprotected and people feel unsafe. We can't take this for granted," he told AAP on the steps of the mosque on Thursday after prayers.
"The stigma attached to the faith, and Islamophobia we face, tells you there's a setback in the values of this country."
Muslim leaders said their community was already reeling after police violently apprehended a group of men who were peacefully praying at a protest against the Israeli president 10 days earlier.
Premier Chris Minns used a Ramadan message to detail why he would not apologise for the policing because he did not believe officers had deliberately caused offence.
But Sheikh Wesam Charkawi, who was leading the prayer when police intervened, said the premier's message did more harm than good.
"The community is feeling like this is further insult ... he's been almost militant in his wording, he's been an alarmist on many issues and he's created such division in NSW," he said.
Mr Minns said Senator Hanson probably owed the Muslim community an apology, but it was unlikely to come.
"We have to accept that words have consequences and you can put hate in someone's heart with that kind of racist demagoguery," he said.
