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:23:52 –

And indeed this, your religion, is one religion, and I am your Lord, so fear Me."  

And know, that this, creed of Islam, is your community, your religion, O you being addressed, that is, you must adhere to it as, one community — a necessary state ˹of affairs˺ (a variant reading ˹for anna, ‘that’˺ has the softened form ˹in˺; a variant has inna, ‘truly’, indicating the beginning of ˹an independent˺ new sentence) and I am your Lord, so fear Me’, so be fearful of Me.
القرآن:٢٣:٥٢ –

وَإِنَّ هَٰذِهِ أُمَّتُكُمْ أُمَّةً وَاحِدَةً وَأَنَا رَبُّكُمْ فَاتَّقُونِ  

{و} اعلموا {إنَّ هذه} أي ملة الإسلام {أمتكم} دينكم أيها المخاطبون أي يجب أن تكونوا عليها {أمة واحدة} حال لازمة وفي قراءة بتخفيف النون وفي أخرى بكسرها مشددة استئنافا {وأنا ربكم فاتقون} فاحذرون.

See similar narrations below:

Collected by Qurʾān
quran:21:92 –

Indeed this, your religion, is one religion, and I am your Lord, so worship Me.  

‘Truly this, creed of Islam, is your community, your religion, O you who are being addressed — in other words, you must adhere to it as, one community, ˹this being˺ a necessary state ˹of affairs˺, and I am your Lord, so worship Me’, affirm My Oneness.
القرآن:٢١:٩٢ –

إِنَّ هَٰذِهِ أُمَّتُكُمْ أُمَّةً وَاحِدَةً وَأَنَا رَبُّكُمْ فَاعْبُدُونِ  

{إن هذه} أي ملة الإسلام {أمتكم} دينكم أيها المخاطبون أي يجب أن تكونوا عليها {أمة واحدة} حال لازمة {وأنا ربكم فاعبدون} وحدون.