سُوْرَةُ فُصِّلَتۡ

Surah Fussilat (41) — Ayah 8

Explained in detail · Meccan · Juz 24 · Page 477

إِنَّ ٱلَّذِينَ ءَامَنُوا۟ وَعَمِلُوا۟ ٱلصَّـٰلِحَـٰتِ لَهُمْ أَجْرٌ غَيْرُ مَمْنُونٍ ﴿8﴾
Truly, those who believe (in the Oneness of Allâh, and in His Messenger Muhammad صلى الله عليه وسلم - Islâmic Monotheism) and do righteous good deeds, for them will be an endless reward that will never stop (i.e. Paradise).
إِنَّ inna Indeed
ٱلَّذِينَ alladhīna those who
ءَامَنُوا۟ āmanū believe
وَعَمِلُوا۟ waʿamilū and do
ٱلصَّـٰلِحَـٰتِ l-ṣāliḥāti righteous deeds
لَهُمْ lahum for them
أَجْرٌ ajrun (is) a reward
غَيْرُ ghayru never ending
مَمْنُونٍۢ mamnūnin never ending

Tafsir Ahsan al-Bayan is a well-known Quran commentary by Hafiz Salahuddin Yusuf, a renowned Salafi (Ahl al-Hadith) scholar from Pakistan. This tafsir explains the meanings of the Quran in accordance with the methodology of the Salaf (early righteous generations), relying on authentic sources and straightforward language. Due to its reliability and adherence to sound Islamic scholarship, the Saudi government publishes and distributes this tafsir among the Hujjaj (pilgrims) visiting the Haramain. The tafsir is originally written in Urdu, translated to English by tohed.com.

8. 1. The meaning of اجر غیر ممنون is the same as عطاء غیر مجذوذ in Hud, that is, a reward that will never end.