Imam al-Shafi'i (may Allah have mercy on him) says: If someone were to say that Ja'far bin Abi Talib (may Allah be pleased with him) hamstrung his horse at the time of battle, (I would say): I neither recall it, nor is it well known among the people of knowledge.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 18137