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:28:14 –

And when he attained his full strength and was ˹mentally˺ mature, We bestowed upon him judgement and knowledge. And thus do We reward the doers of good.  

And when he came of age, namely, at 30 or 33, and ˹then˺ was ˹fully˺ mature, that is, when he reached the age of 40, We gave him judgement, wisdom, and knowledge, comprehension of religious matters before he was sent as a prophet. And so, just as We rewarded him, do We reward those are virtuous, to their own souls.
القرآن:٢٨:١٤ –

وَلَمَّا بَلَغَ أَشُدَّهُ وَاسْتَوَىٰ آتَيْنَاهُ حُكْمًا وَعِلْمًا ۚ وَكَذَٰلِكَ نَجْزِي الْمُحْسِنِينَ  

{ولما بلغ أشده} وهو ثلاثون سنة أو وثلاث {واستوى} أي بلغ أربعين سنة {آتيناه حكماً} حكمة {وعلماً} فقهاً في الدين قبل أن يبعث نبياً {وكذلك} كما جزيناه {نجزي المحسنين} لأنفسهم.

See similar narrations below:

Collected by Qurʾān
quran:12:22 –

And when Joseph reached maturity, We gave him judgment and knowledge. And thus We reward the doers of good.  

And when he reached his prime — which was at 30 or 33 years of age — We gave him ˹power of˺ judgement, wisdom, and knowledge, understanding in ˹matters of˺ religion, before his call to prophethood. Thus, just as We rewarded him, We reward those who are virtuous, to ˹the good˺ of their souls.
القرآن:١٢:٢٢ –

وَلَمَّا بَلَغَ أَشُدَّهُ آتَيْنَاهُ حُكْمًا وَعِلْمًا ۚ وَكَذَٰلِكَ نَجْزِي الْمُحْسِنِينَ  

{ولما بلغ أشده} وهو ثلاثون سنة أو وثلاث {آتيناه حكما} حكمة {وعلما} فقها في الدين قبل أن يبعث نبيا {وكذلك} كما جزيناه {نجزي المحسنين} لأنفسهم.