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
ahmad:3905 – ʿAffān > Masʿūd b. Saʿd > Khuṣayf > Abū ʿUbaydah from his father

[Machine] The Messenger of Allah ﷺ wrote about the charity of cows that when the cow reaches the age of thirty, you can sell a calf from the cow until it reaches the age of forty. When it reaches the age of forty, it becomes an adult cow. And if the number of cows increases, then for every forty cows, there should be one adult cow.  

أحمد:٣٩٠٥ – حَدَّثَنَا عَفَّانُ حَدَّثَنَا مَسْعُودُ بْنُ سَعْدٍ حَدَّثَنَا خُصَيْفٌ عَنْ أَبِي عُبَيْدَةَ عَنْ أَبِيهِ قَالَ

كَتَبَ رَسُولُ اللهِ ﷺ فِي صَدَقَةِ الْبَقَرِ إِذَابَلَغَ الْبَقَرُ ثَلَاثِينَ فِيهَا تَبِيعٌ مِنَ الْبَقَرِ جَذَعٌ أَوْ جَذَعَةٌ حَتَّى تَبْلُغَ أَرْبَعِينَ فَإِذَا بَلَغَتْ أَرْبَعِينَ فَفِيهَا بَقَرَةٌ مُسِنَّةٌ فَإِذَا كَثُرَتِ الْبَقَرُ فَفِي كُلِّ أَرْبَعِينَ مِنَ الْبَقَرِ بَقَرَةٌ مُسِنَّةٌ  

See similar narrations below:

Collected by Nasāʾī, Nasāʾī's Kubrá, Suyūṭī
nasai:2453 – Muḥammad b. Manṣūr al-Ṭūsī > Yaʿqūb from my father > Ibn Isḥāq > Sulaymān al-Aʿmash > Abū Wāʾil b. Salamah > Muʿādh b. Jabal

The Messenger of Allah commanded me not to take any cattle until the number had reached thirty. If the number reached thirty, then a Jadh'ah calf in its second year, either male or female, was due on them, until the number reached forty. If the number reached forty. If the number reached forty, then a Musinnah was due on them." (Daif)  

النسائي:٢٤٥٣ – أَخْبَرَنَا مُحَمَّدُ بْنُ مَنْصُورٍ الطُّوسِيُّ قَالَ حَدَّثَنَا يَعْقُوبُ قَالَ حَدَّثَنَا أَبِي عَنِ ابْنِ إِسْحَاقَ قَالَ حَدَّثَنِي سُلَيْمَانُ الأَعْمَشُ عَنْ أَبِي وَائِلِ بْنِ سَلَمَةَ عَنْ مُعَاذِ بْنِ جَبَلٍ قَالَ

أَمَرَنِي رَسُولُ اللَّهِ ﷺ حِينَ بَعَثَنِي إِلَى الْيَمَنِ أَنْ لاَ آخُذَ مِنَ الْبَقَرِ شَيْئًا حَتَّى تَبْلُغَ ثَلاَثِينَ فَإِذَا بَلَغَتْ ثَلاَثِينَ فَفِيهَا عِجْلٌ تَابِعٌ جَذَعٌ أَوْ جَذَعَةٌ حَتَّى تَبْلُغَ أَرْبَعِينَ فَإِذَا بَلَغَتْ أَرْبَعِينَ فَفِيهَا بَقَرَةٌ مُسِنَّةٌ  

nasai-kubra:2245 – Muḥammad b. Manṣūr > Yaʿqūb from my father > Ibn Isḥāq > Sulaymān al-Aʿmash > Abū Wāʾil b. Salamah > Muʿādh b. Jabal

The Messenger of Allah commanded me not to take any cattle until the number had reached thirty. If the number reached thirty, then a Jadh'ah calf in its second year, either male or female, was due on them, until the number reached forty. If the number reached forty. If the number reached forty, then a Musinnah was due on them." (Daif) (Using translation from Nasāʾī 2453)  

الكبرى للنسائي:٢٢٤٥ – أَخْبَرَنَا مُحَمَّدُ بْنُ مَنْصُورٍ قَالَ حَدَّثَنَا يَعْقُوبُ قَالَ حَدَّثَنَا أَبِي عَنِ ابْنِ إِسْحَاقَ قَالَ حَدَّثَنِي سُلَيْمَانُ الْأَعْمَشُ عَنْ أَبِي وَائِلِ بْنِ سَلَمَةَ عَنْ مُعَاذِ بْنِ جَبَلٍ قَالَ

«أَمَرَنِي رَسُولُ اللهِ ﷺ حِينَ بَعَثَنِي إِلَى الْيَمَنِ أَنْ لَا آخُذَ مِنَ الْبَقَرِ شَيْئًا حَتَّى تَبْلُغَ ثَلَاثِينَ فَإِذَا بَلَغَتْ ثَلَاثِينَ فَفِيهَا عِجْلٌ تَابِعٌ جَذَعٌ أَوْ جَذَعَةٌ حَتَّى تَبْلُغَ أَرْبَعِينَ فَإِذَا بَلَغَتْ أَرْبَعِينَ فَفِيهَا بَقَرَةٌ مُسِنَّةٌ»  

suyuti:1463a –
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السيوطي:١٤٦٣a –

"إذا بلَغ البقرُ ثلاثين ففيها تَبيعٌ من البقر: جَذعٌ أو جذَعةٌ حتى تبْلغَ أربعين، فإذا بلغتْ أربعين ففيها بقرةٌ مُسِنَّةٌ، فإذا كَثُرتْ البَقَرُ ففي كُلِّ أرْبعين من البقرِ بَقَرةُ مسنَّةٌ".  

[حم] أحمد عن ابن مسعود