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:38:46 –

Indeed, We chose them for an exclusive quality: remembrance of the home ˹of the Hereafter˺.  

Assuredly We purified them with an exclusive ˹thought˺, namely, the remembrance of the Abode, of the Hereafter: in other words to ˹always˺ remember it and to work for it (a variant reading ˹for bi-khālisatin dhikrā’l-dār˺ has the genitive construction ˹bi-khālisati dhikrā’l-dār˺, making this ˹dhikrā al-dār, ‘remembrance of the Abode’˺ the explicative thereof).
القرآن:٣٨:٤٦ –

إِنَّا أَخْلَصْنَاهُمْ بِخَالِصَةٍ ذِكْرَى الدَّارِ  

{إنا أخلصناهم بخالصة} هي {ذكرى الدار} الآخرة، أي ذكرها والعمل لها، وفي قراءة بالإضافة وهي للبيان.