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
darimi:3240 – Sulaymān b. Ḥarb > Ḥammād b. Zayd > Isḥāq b. Sūwayd > al-ʿAlāʾ b. Ziyād > Abāh Ziyād b. Maṭar Awṣá

[Machine] "My will is what the scholars of Basra agreed upon." So, I asked and they agreed on one/fifth.  

الدارمي:٣٢٤٠ – حَدَّثَنَا سُلَيْمَانُ بْنُ حَرْبٍ حَدَّثَنَا حَمَّادُ بْنُ زَيْدٍ عَنْ إِسْحَاقَ بْنِ سُوَيْدٍ عَنْ الْعَلَاءِ بْنِ زِيَادٍ أَنَّ أَبَاهُ زِيَادَ بْنَ مَطَرٍ أَوْصَى فَقَالَ

«وَصِيَّتِي مَا اتَّفَقَ عَلَيْهِ فُقَهَاءُ أَهْلِ الْبَصْرَةِ» فَسَأَلْتُ فَاتَّفَقُوا عَلَى الْخُمُسِ