the two Sahihs and other collections, in reports from Abu Hurayrah and Abu Dharr. Ibn Hibban also recorded it (4577). See al-Targhib (2/172–173), if you wish.
2898 — “Whoever grants a Muslim the use of his stallion for breeding will have the reward of seventy horses ridden in the cause of Allah. If no offspring results, he will have the reward of one horse ridden in the cause of Allah.”
It was recorded by Ibn Hibban (1637, al-Mawarid), Ahmad (4/231), Abu Ishaq al-Harbi in Gharib al-Hadith (5/9/1), and al-Tabarani in al-Muʿjam al-Kabir (22/341/853), through several routes from Muhammad ibn Harb, from al-Zubaydi, from Rashid ibn Saʿd, from Abu ʿAmir al-Hawzani, from Abu Kabshah al-Anmari, who came to a man and said: “Grant me the use of your stallion for breeding, for I heard the Messenger of Allah, peace and blessings be upon him, say...” He then cited the hadith.
I say: This is an authentic Syrian chain of transmission. All its narrators are reliable and included in al-Tahdhib. Abu Kabshah al-Anmari was a well-known Companion who settled in Syria. There is disagreement concerning his name, but al-Tirmidhi stated definitively that it was ʿUmar ibn Saʿd. Abu ʿAmir al-Hawzani’s name was ʿAbd Allah ibn Luhayy, and al-Zubaydi’s name was Muhammad ibn al-Walid.
The hadith also has a corroborating report attributed to the Companion Ibn ʿUmar, narrated by Taysalah ibn ʿAli, who said: “There is nothing that people have ever extended to one another better than granting breeding service: a man grants the use of his stallion, and his reward continues to accrue; a man grants the use of his breeding male, and his reward continues to accrue; and a man grants the use of his ram, and his reward continues to accrue.” Al-Tabarani recorded it in al-Muʿjam al-Kabir (12/264/13061) through Ziyad ibn Mikhraq, from him.