Sura al-Qaṣaṣ 28:80

وَقَالَ ٱلَّذِينَ أُوتُوا۟ ٱلْعِلْمَ وَيْلَكُمْ ثَوَابُ ٱللَّـهِ خَيْرٌ لِّمَنْ ءَامَنَ وَعَمِلَ صَٰلِحًا وَلَا يُلَقَّىٰهَآ إِلَّا ٱلصَّٰبِرُونَ

wa-qāla lladhīna ūtū l-ʿilma waylakum thawābu allāhi khayrun li-man āmana wa-ʿamila ṣāliḥan wa-lā yulaqqāhā illā l-ṣābirūna

But those who had been granted (true) knowledge said: "Alas for you! The reward of Allah (in the Hereafter) is best for those who believe and work righteousness: but this none shall attain, save those who steadfastly persevere (in good)."