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
bayhaqi:12572 – Abū Zakariyyā And ʾAbū Bakr > Abū al-ʿAbbās > Muḥammad > Ibn Wahb > Rijāl from Ahl al-ʿIlm Minhum ʿUmar b. Muḥammad b. Zayd b. ʿAbdullāh b. ʿUmar b. al-Khaṭṭāb Waʿabd Allāh b. ʿUmar Wayūnus b. Yazīd Waghayruhum > Nāfiʿ > ʿAbdullāh b. ʿUmar > ʿUmar b. al-Khaṭṭāb Suʾil > al-Waṣiyyah

[Machine] The age of thirty is a moderate amount of wealth, with no stinginess or extravagance.  

البيهقي:١٢٥٧٢ – أَخْبَرَنَا أَبُو زَكَرِيَّا وَأَبُو بَكْرٍ قَالَا ثنا أَبُو الْعَبَّاسِ أنا مُحَمَّدٌ أنا ابْنُ وَهْبٍ أَخْبَرَنِي رِجَالٌ مِنْ أَهْلِ الْعِلْمِ مِنْهُمْ عُمَرُ بْنُ مُحَمَّدِ بْنِ زَيْدِ بْنِ عَبْدِ اللهِ بْنِ عُمَرَ بْنِ الْخَطَّابِ ؓ وَعَبْدُ اللهِ بْنُ عُمَرَ وَيُونُسُ بْنُ يَزِيدَ وَغَيْرُهُمْ أَنَّ نَافِعًا حَدَّثَهُمْ عَنْ عَبْدِ اللهِ بْنِ عُمَرَ أَنَّ عُمَرَ بْنَ الْخَطَّابِ ؓ سُئِلَ عَنِ الْوَصِيَّةِ فَقَالَ

عُمَرُ الثُّلُثُ وَسَطٌ مِنَ الْمَالِ لَا بَخْسَ وَلَا شَطَطَ  

See similar narrations below:

Collected by Suyūṭī