Diddy offered a hotel security guard a stack of money to keep quiet about the Cassie beating … at least according to the guy’s court testimony.

The first witness called to the stand in Diddy’s sex trafficking case Monday was the assistant director of security at the InterContinental Los Angeles Century City at Beverly Hills Hotel … and he was grilled about the infamous 2016 incident between Diddy and Cassie.

The witness, Israel Flores, says he got a report of a woman in distress on the 6th floor around 11 AM and checked the cameras … and saw Diddy pacing back and forth.

Cassie stated she asked for her phone and her bag and wanted to leave, but Diddy told her she couldn’t leave … Flores testified.

Flores told the jury Diddy later called for him and was holding a stack of money … telling him not to tell anyone about what happened. He testified that he told Diddy he didn’t want the money, and the damage would still be charged to the room.

The hotel security guard testified he went to Diddy’s room to remind him of hotel rules … and Diddy opened the door and grabbed his phone, and asked if he was recording Diddy. Flores says he pinned Diddy to the wall.

Flores says he took photos of the broken vase for an incident report and recorded two videos of the surveillance footage with his iPhone, explaining he wanted to show his wife at home.

He says he had the following two days off — and when he returned to work, he looked for the surveillance video … but “it was gone” and he never saw it again until recently.

On cross-examination, Diddy attorney Brian Steel asked Flores if law enforcement was called, and Flores said, “they were not.” He asked why Flores didn’t put that in the report and why he didn’t include the part about Diddy allegedly telling Cassie she wasn’t leaving. Flores said he didn’t put every last detail in his reports.

Steel asked Flores, “You were offered a bribe — but hadn’t you told him he had to pay for the vase?” Flores responded, “Yes.”

The prosecution circled back and asked Flores what Diddy said when he allegedly offered the money, and Flores testified that Diddy didn’t want anyone to know about what happened.

Flores also testified that the video shows Diddy dragging Cassie back to the room … and Steel asked if there are gaps in the footage because the cameras are motion sensitive, and Flores said, “Yes.”