What is promised in this world, not the next
A specific guarantee, made about the life you are living now.
مَنْ عَمِلَ صَـٰلِحًا مِّن ذَكَرٍ أَوْ أُنثَىٰ وَهُوَ مُؤْمِنٌ فَلَنُحْيِيَنَّهُۥ حَيَوٰةً طَيِّبَةً ۖ وَلَنَجْزِيَنَّهُمْ أَجْرَهُم بِأَحْسَنِ مَا كَانُوا۟ يَعْمَلُونَ
Man ʿamila ṣāliḥan min dhakarin aw unthā wa huwa mu'minun fa-la-nuḥyiyannahu ḥayātan ṭayyibah…
“Whoever does righteousness, whether male or female, while he is a believer - We will surely cause him to live a good life, and We will surely give them their reward [in the Hereafter] according to the best of what they used to do.”
Source
The Qur'an · 16:97
Qur'an
- Qur'anic text in the Uthmani script via Quran.com; translation: Saheeh International