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:50:18 –

Man does not utter any word except that with him is an observer prepared ˹to record˺.  

he does not utter a word but that there is beside him a watcher, a guardian, ˹who is˺ ready, present (both ˹raqībun, ‘watcher’, and ‘atīdun, ‘ready’˺ are meant to indicate the dual).
القرآن:٥٠:١٨ –

مَا يَلْفِظُ مِنْ قَوْلٍ إِلَّا لَدَيْهِ رَقِيبٌ عَتِيدٌ  

{ما يلفظ من قول إلا لديه رقيب} حافظ {عتيد} حاضر وكل منهما بمعنى المثنى.