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:15:9 –

Indeed, it is We who sent down the Qur'an and indeed, We will be its guardian.  

Verily it is We (nahnu emphasises the subject of inna, or ˹functions as˺ a separating pronoun) Who have revealed the Remembrance, the Qur’ān, and assuredly We will preserve it, against substitution, distortion, additions and omissions.
القرآن:١٥:٩ –

إِنَّا نَحْنُ نَزَّلْنَا الذِّكْرَ وَإِنَّا لَهُ لَحَافِظُونَ  

{إنا نحن} تأكيد لاسم إن أو فصل {نزلنا الذكر} القرآن {وإنا له لحافظون} من التبديل والتحريف والزيادة والنقص.