A rapping jihadi from south east London hailed “Boris’s treachery, stupidity and deceit” as he allegedly plotted an attack on British soil, a court has heard.

Sahayb Abu, 27, of South Norwood bought an 18-inch sword and discussed guns with an undercover officer before his arrest on July 9 last year, the Old Bailey has heard.

The Islamic State fanatic and his brother Muhamed Abu, 32, shared recorded raps about their extremist ideas, jurors were told.

On May 27 last year, Sahayb Abu, under the name of Max, exchanged messages with a sword retailer about the sale of items on its website despite the coronavirus lockdown.

The same day, he discussed with Muhamed Abu the state of the western world, the court heard.

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In a message, Sahayb Abu wrote: “Boris is going to do well for the Ummah (world’s Muslims) and he doesn’t even know it.

“His treachery, stupidity and deceit will cause riots and economic strife to this country to the extent they are gonna have to set up a go fund me account for their crusade wars against the Ummah of Mohammed.”

Muhamed Abu wrote: “An ever so weak West will emerge… and the West will fall.”

His brother replied: “Allahu Akbar. The time is nigh.”

Sahayb Abu allegedly went on to buy online two blades, a combat vest, two balaclavas, fingerless gloves and a combat-style hat.

Following his arrest he denied being a supporter of IS.

He said he had the combat vest, balaclavas, gloves and hat because he parodied rap or drill videos.

In his interview, Muhamed Abu described his brother as a “keyboard warrior” who was “full of hot air”.

Sahayb Abu, of Dagenham, east London, denies preparation of terrorist acts.

Muhamed Abu, of South Norwood, south-east London, denies failing to disclose information about acts of terrorism.