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:77:50 –

Then in what statement after the Qur'an will they believe?  

In what discourse, then, after this, namely, the Qur’ān, will they believe? In other words, they cannot believe in any other of God’s Scriptures after having denied this ˹Qur’ān˺, since it comprises that inimitability (i‘jāz) which none of the others do. Meccan, consisting of 40 or 41 verses.
القرآن:٧٧:٥٠ –

فَبِأَيِّ حَدِيثٍ بَعْدَهُ يُؤْمِنُونَ  

{فبأي حديث بعده} أي القرآن {يؤمنون} أي لا يمكن إيمانهم بغيره من كتب الله بعد تكذيبهم به لاشتماله على الإعجاز الذي لم يشتمل عليه غيره.