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:36:21 –

Follow those who do not ask of you ˹any˺ payment, and they are ˹rightly˺ guided.  

Follow (ittabi‘ū, this reiterates the preceding ˹ittabi‘ū˺) them who do not ask you for any reward, in return for ˹delivering to you˺ the message, and who are rightly guided. And so he was asked, ‘Do you follow their religion?’ So he replied:
القرآن:٣٦:٢١ –

اتَّبِعُوا مَنْ لَا يَسْأَلُكُمْ أَجْرًا وَهُمْ مُهْتَدُونَ  

{اتبعوا} تأكيد للأول {مَن لا يسألكم أجرا} على رسالته {وهم مهتدون} فقيل له: أنت على دينهم.