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:74:25 –

This is not but the word of a human being."  

this is nothing but the speech of humans’, similar to what they ˹the idolaters˺ had said: ‘It is only a human that is teaching him’ ˹Q. 16:103˺.
القرآن:٧٤:٢٥ –

إِنْ هَٰذَا إِلَّا قَوْلُ الْبَشَرِ  

ما {إن هذا إلا قول البشر} كما قالوا إنما يعلمه بشر.

See similar narrations below:

Collected by Qurʾān
quran:26:137 –

This is not but the custom of the former peoples,  

This, that you threaten us with, is merely the fabrication of the ancients, that is, their inventions and lies (a variant reading ˹for khalq, ‘fabrication’˺ is khuluq, ‘ethos’, in other words, this denial of resurrection to which we adhere is merely ‘the ethos of the ancients’, in other words, their nature and wont);
القرآن:٢٦:١٣٧ –

إِنْ هَٰذَا إِلَّا خُلُقُ الْأَوَّلِينَ  

{إن} ما {هذا} الذي خوفنا به {إلا خَلْق الأولين} اختلافهم وكذبهم وفي قراءة بضم الخاء واللام أي ما هذا الذي نحن عليه من إنكار للبعث إلا خلق الأولين أي طبيعتهم وعادتهم.