Ali 'Imran 3:171

Yastabshiroona biniAAmatin mina Allahiwafadlin waanna Allaha la yudeeAAuajra almu/mineen

They receive good tidings of favor from Allāh and bounty and [of the fact] that Allāh does not allow the reward of believers to be lost -

They feel pleased with blessing from Allah, and grace, and with the fact that Allah would not let the reward of the believers be lost.