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:67:26 –

Say, "The knowledge is only with Allah, and I am only a clear warner."  

Say: ‘The knowledge, of its coming, is only with God, and I am but a plain warner’, one whose warning is plain.
القرآن:٦٧:٢٦ –

قُلْ إِنَّمَا الْعِلْمُ عِنْدَ اللَّهِ وَإِنَّمَا أَنَا نَذِيرٌ مُبِينٌ  

{قل إنما العلم} بمجيئه {عند الله وإنما أنا نذير مبين} بيِّن الإنذار.

See similar narrations below:

Collected by Qurʾān
quran:29:50 –

But they say, "Why are not signs sent down to him from his Lord?" Say, "The signs are only with Allah, and I am only a clear warner."  

And they, namely, the disbelievers of Mecca, say, ‘Why has not some sign been sent down to him, ˹to˺ Muhammad (s), from his Lord?’ (āyatun, ‘sign’: a variant reading has āyātun, ‘signs’) such as the she-camel of Sālih, or the staff of Moses, or the Table of Jesus. Say, to them: ‘Signs are only with God, and He sends them down as He will, and I am only a plain warner’, making manifest my warning of ˹the punishment of˺ the Fire for disobedient people.
القرآن:٢٩:٥٠ –

وَقَالُوا لَوْلَا أُنْزِلَ عَلَيْهِ آيَاتٌ مِنْ رَبِّهِ ۖ قُلْ إِنَّمَا الْآيَاتُ عِنْدَ اللَّهِ وَإِنَّمَا أَنَا نَذِيرٌ مُبِينٌ  

{وقالوا} أي كفار مكة {لولا} هلا {أنزل عليه} أي محمد {آية من ربه} وفي قراءة آيات كناقة صالح وعصا موسى ومائدة عيسى {قل} لهم {إنما الآيات عند الله} ينزلها كيف يشاء {وإنما أنا نذير مبين} مظهر إنذاري بالنار أهل المعصية.