Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
quran:46:14 –

Those are the companions of Paradise, abiding eternally therein as reward for what they used to do.  

Those will be the inhabitants of Paradise, abiding therein (khālidīna fīhā is a circumstantial qualifier) as a reward (jazā’an is in the accusative as a verbal noun, because of the implied verbal action, that is to say, yujzawna, ‘they will be rewarded’) for what they used to do.
القرآن:٤٦:١٤ –

أُولَٰئِكَ أَصْحَابُ الْجَنَّةِ خَالِدِينَ فِيهَا جَزَاءً بِمَا كَانُوا يَعْمَلُونَ  

{أولئك أصحاب الجنة خالدين فيها} حال {جزاءً} منصوب على المصدر بفعله المقدر، أي يجزون {بما كانوا يعملون}.

See similar narrations below:

Collected by Qurʾān
quran:2:82 –

But they who believe and do righteous deeds - those are the companions of Paradise; they will abide therein eternally.  

And those who believe and perform righteous deeds — those are the inhabitants of Paradise, therein abiding.
القرآن:٢:٨٢ –

وَالَّذِينَ آمَنُوا وَعَمِلُوا الصَّالِحَاتِ أُولَٰئِكَ أَصْحَابُ الْجَنَّةِ ۖ هُمْ فِيهَا خَالِدُونَ  

{والذين آمنوا وعملوا الصالحات أولئك أصحاب الجنة هم فيها خالدون}.