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:6:115 –

And the word of your Lord has been fulfilled in truth and in justice. None can alter His words, and He is the Hearing, the Knowing.  

Perfected is the word of your Lord, in the way of rulings and appointed terms, in truthfulness and justice (sidqan wa-‘adlan is for specification); none can change His words, either by contravening ˹His rulings˺ or evading ˹His appointed terms˺. He is the Hearing, of what is said, the Knowing, of what is done.
القرآن:٦:١١٥ –

وَتَمَّتْ كَلِمَتُ رَبِّكَ صِدْقًا وَعَدْلًا ۚ لَا مُبَدِّلَ لِكَلِمَاتِهِ ۚ وَهُوَ السَّمِيعُ الْعَلِيمُ  

{وتمت كَلِمَاتُ ربَك} بالأحكام والمواعيد {صدقا وعدلا} تمييز {لا مبدِّل لكلماته} بنقص أو خلف {وهو السميع} لما يقال {العليم} بما يفعل.