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:39:70 –

And every soul will be fully compensated ˹for˺ what it did; and He is most knowing of what they do.  

And every soul will be paid in full for what it did, that is, ˹it will be paid˺ the requital thereof, and He is best aware of what they do, and has no need for any witnesses.
القرآن:٣٩:٧٠ –

وَوُفِّيَتْ كُلُّ نَفْسٍ مَا عَمِلَتْ وَهُوَ أَعْلَمُ بِمَا يَفْعَلُونَ  

{ووفّيَتْ كلُّ نفس ما عملت} أي جزاءه {وهو أعلم} عالم {بما يفعلون} فلا يحتاج إلى شاهد.