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
bayhaqi:14433 – Abū Saʿd al-Mālīnī > Abū Aḥmad b. ʿAdī al-Ḥāfiẓ > Muḥammad b. Khuraym al-Qazzāz > Hishām b. Khālid > Marwān b. Muʿāwiyah > Kathīr b. ʿAbdullāh al-Muzanī from his father from his grandfather > Rasūl Allāh Ṣllá

[Machine] The Prophet ﷺ said: Muslims are bound by their conditions, except for a condition that forbids what is permissible or allows what is forbidden, and this applies likewise.  

البيهقي:١٤٤٣٣ – أَخْبَرَنَاهُ أَبُو سَعْدٍ الْمَالِينِيُّ أنبأ أَبُو أَحْمَدَ بْنُ عَدِيٍّ الْحَافِظُ ثنا مُحَمَّدُ بْنُ خُرَيْمٍ الْقَزَّازُ ثنا هِشَامُ بْنُ خَالِدٍ ثنا مَرْوَانُ بْنُ مُعَاوِيَةَ عَنْ كَثِيرِ بْنِ عَبْدِ اللهِ الْمُزَنِيِّ عَنْ أَبِيهِ عَنْ جَدِّهِ قَالَ

قَالَ رَسُولُ اللهِ ﷺ الْمُسْلِمُونَ عِنْدَ شُرُوطِهِمْ إِلَّا شَرْطًا حَرَّمَ حَلَالًا أَوْ شَرْطًا أَحَلَّ حَرَامًا وَكَذَلِكَ  

رَوَاهُ أَبُو مُعَاوِيَةَ الضَّرِيرُ عَنْ كَثِيرٍ وَرُوِيَ مَعْنَاهُ مِنْ وَجْهٍ آخَرَ