Surah Ali 'Imran 3:171

۞ يَسْتَبْشِرُونَ بِنِعْمَةٍ مِّنَ ٱللَّهِ وَفَضْلٍ وَأَنَّ ٱللَّهَ لَا يُضِيعُ أَجْرَ ٱلْمُؤْمِنِينَ

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 -

Translation: Saheeh International

Tafsir

Joyful in grace in the reward and bounty in addition to it from God and that read wa-anna as a supplement to ni‘matin or wa-inna to denote a new clause God does not let the wage of believers go to waste but rewards them.

Excerpt from Tafsir al-Jalalayn, commentary on 3:171, via Quran.com. The reader has the full commentary and 9 more tafsirs.