A man accused of murdering businesswoman Lynda Spence told a barman the pub would "go up in flames" amid a dispute with the owner, a court has heard.
Paul Boyle was working at Bier Stube on Glasgow's southside when Colin Coats asked him to pass on the message to pub owner Patrick Burns in June 2011, he said.
Coats, 42, and three other men deny the abduction and murder of financial adviser Ms Spence.
The 27-year-old was last seen in Glasgow in April 2011.
At the trial at the High Court in the city, Mr Burns told the jury that in May 2010 Coats had delivered cash to him that he understood to be a rent payment from Ms Spence. He said a year later, Coats demanded the £1,200 cash back plus interest.
Giving evidence, Mr Boyle said Coats asked him to give Mr Burns a message after entering the pub looking "angry".
The witness said: "He told me that Patrick had made a big mistake which would mean that he'd (Coats) be getting the jail today, which would mean that the pub would be going up in flames."
Mr Burns told the jury Ms Spence had owed him rent money, and she instructed him to meet Coats at the McDonald's car park on Crow Road, Glasgow, where he handed him the £1,200 cash.
Derek Ogg, defending Coats, suggested to Mr Burns that the cash had been a "street loan" from Coats. He said: "You were in desperate need of money, you got a street loan from Mr Coats and you thought you could bump him. You didn't pay him a penny and you eventually had to pay him back." Mr Burns told the jury that was not correct.
Coats, David Parker, 38, Paul Smith, 47, and Philip Wade, 42, deny torturing Ms Spence for up to a fortnight before killing her in order to obtain financial details. An ex-employee of Ms Spence has previously told the court that Coats was involved in business dealings with the alleged victim.