David Cameron has repeated the remark "you ain't no Muslim, bruv" and praised the man who said it to the suspected Leytonstone Tube attacker.
The 29-year-old suspect, Muhaydin Mire, allegedly shouted "this is for Syria" after an incident in which three people were stabbed in the East London tube station and a video of the man telling the suspected attacker he "ain't no Muslim" has become a unifying call among people condemning the attack.
The Prime Minister said the man had done "much better than I ever could" in denouncing the use of Islam to justify terrorist attacks.
Speaking after a speech on Monday, Mr Cameron said: "Some of us have dedicated speeches and media appearances and sound-bites and everything to this subject but 'you ain't no Muslim, bruv' says it all, much better than I ever could and thank you because that will be applauded all around the country."
Police are treating the Leytonstone stabbing as a terrorist incident because of reports the attacker suggested he acted in revenge for British air strikes on Isis in Syria, launched after a vote in the House of Commons just three days earlier.
The 'you ain't no Muslim bruv' phrase became the top-trending hashtag on Twitter across the UK on Sunday morning, used by Muslims and non-Muslims alike to denounce hate.
Scotland Yard said Mr Mire will appear at Westminster Magistrates Court on Monday charged with attempted murder of a 56-year-old man.
