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:16:51 –

And Allah has said, "Do not take for yourselves two deities. He is but one God, so fear only Me."  

And God has said: ‘Do not choose two gods (ithnayn is for emphasis). Truly there is only One God — He has added this ˹statement˺ to affirm ˹His˺ Divinity and Oneness — so be in awe of Me ˹alone˺’: fear Me, to the exclusion of anyone else — herein is a shift from the third person ˹to the first˺.
القرآن:١٦:٥١ –

وَقَالَ اللَّهُ لَا تَتَّخِذُوا إِلَٰهَيْنِ اثْنَيْنِ ۖ إِنَّمَا هُوَ إِلَٰهٌ وَاحِدٌ ۖ فَإِيَّايَ فَارْهَبُونِ  

{وقال الله لا تتخذوا إلهين اثنين} تأكيد {إنما هو إله واحد} أتى به لإثبات الإلهية والوحدانية {فإياي فارهبون} خافون دون غيري وفيه التفات عن الغيبة.