(And (there are) others who await Allah's decree…) [9:106].
This verse was revealed about Ka'b ibn Malik, Murarah ibn al-Rabi', from the Banu 'Amr ibn 'Awf and Hilal ibn Umayyah, from the Banu Waqif. The three failed join the Muslim army at the Battle of Tabuk. They are the ones referred to in Allah's saying (And to the three (did He turn in mercy) who were left behind…) [9:118].
Asbab Al-Nuzul by Al-Wahidi , trans. Mokrane Guezzou