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:7502 – Abū Saʿd al-Mālīnī > Abū Aḥmad b. ʿAdī al-Ḥāfiẓ > al-Sājī > Ibn al-Muthanná > ʿAbd al-Ṣamad > Yazīd b. Dirham > Anas Wātūā Ḥaqqah Yawm Ḥaṣādih al-Nʿām 141

[Machine] Zakat is both obligatory and restricted to specific categories in Islam.  

البيهقي:٧٥٠٢ – أَخْبَرَنَا أَبُو سَعدٍ الْمَالِينِيُّ أنبأ أَبُو أَحْمَدَ بْنُ عَدِيٍّ الْحَافِظُ أنبأ السَّاجِيُّ ثنا ابْنُ الْمُثَنَّى ثنا عَبْدُ الصَّمَدِ عَنْ يَزِيدَ بْنِ دِرْهَمٍ عَنْ أَنَسٍ {وَآتُوا حَقَّهُ يَوْمَ حَصَادِهِ} [الأنعام 141] قَالَ

الزَّكَاةُ وَهُمَا مَوْقُوفَانِ غَيْرُ قَوِيَّيْنِ