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:74:6 –

And do not confer favor to acquire more  

And do not grant a favour seeking greater gain (read tastakthiru as a circumstantial qualifier) in other words, do not give something in order to demand more in return: this ˹stipulation˺ is specific to the Prophet (s), since he is enjoined to ˹adopt˺ the fairest traits and the noblest of manners;
القرآن:٧٤:٦ –

وَلَا تَمْنُنْ تَسْتَكْثِرُ  

{ولا تمنن تستكثر} بالرفع حال، أي لا تعط شيئا لتطلب أكثر منه وهذا خاص به ﷺ لأنه مأمور بأجمل الأخلاق وأشرف الآداب.