Mo Farah won silver in the 5,000m final here at the London Stadium on Saturday night to leave the track in disappointment.
Instead, a brilliantly executed race by Chijindu Ujah, Adam Gemili, Danny Talbot and Nethaneel Mitchell-Blake gave Britain gold in 37.47 seconds, the best time in the world this year.
The 34-year-old Farah was momentarily demoted to fourth place but as Edris held on for a momentous victory in 13.32.79, he dug as deep as he could to pip Chelimo on the line and finish with silver in 13.33.22, before he was left on the track exhausted and heartbroken.
Having won gold in the 10,000m Farah was the favourite to take the 5,000m gold as well. I was stronger. Mo has many victories but now I have one. I didn't have a single bit left at the end.
"Tactically, I was trying to cover every move but they had a game-plan".
FDA Reports That 5 People Have Died After Weight Loss Balloon Treatments
In the treatment, a silicone balloon is inserted via the patient's throat into their stomach , then filled with a saline solution. Endoscopic placement of the balloon is temporary and reversible without surgical incisions.
Bekele, a year older than Farah at 35, won nine global golds, once went unbeaten for eight years at 10,000 metres, won 11 world cross-country titles and now holds the second-fastest marathon time in history (2 hours 3 minutes 3 seconds).
Everyone had expected the British distance runner to win gold but he was beaten by Muktar Edris of Ethiopia.
"It's been a long journey but it's been incredible", Farah added. "I don't know how you can't see him as our greatest ever athlete". "It's not an excuse, but it took a lot more out of me than I realised". It doesn't quite sink in until you compete here and cross the line - I had a couple of minutes to myself - that this is it. That's what they did tonight, and the better man won on the day. "I got boxed in early on - it doesn't normally happen - but I got boxed in early and couldn't get out".
However, Edris and team-mate Yomif Kejelcha seized the initiative as the bell went and Farah struggled to go with them.