Mishkat al-Masabih #2747
Business Transactions
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ أَنَسٍ: أَنَّ رَجُلًا مِنْ كِلَابٍ سَأَلَ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ عَنْ عَسْبِ الْفَحْلِ فَنَهَاهُ فَقَالَ: يَا رَسُولَ اللَّهِ إِنَّا نُطْرِقُ الْفَحْلَ فَنُكْرَمُ فَرَخَّصَ لَهُ فِي الْكَرَامَةِ. رَوَاهُ التِّرْمِذِيّ
Anas said that a man of Kilab asked the Prophet about hiring a stallion to cover a female and he forbade him; but when he said, "Messenger of God, we lend a stallion to cover a female and are given a present," he gave him licence to accept a present.
Tirmidhi transmitted it.
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About Mishkat al-Masabih
This hadith is #2747 from Mishkat al-Masabih, in the Book of Business Transactions.