Ikhtilaf Abi Hanifa wa Ibn Abi Layla

Ikhtilaf Abi Hanifa wa Ibn Abi Layla (Arabic: اختلاف أبي حنيفة وابن أبي ليلى) is an 8th-century classical Islamic legal text attributed to Abu Yusuf. The work records points of disagreement between two main legal authorities of the time, Abu Hanifa and Ibn Abi Layla, both of whom Abu Yusuf studied under. It is considered the earliest known Islamic text to record legal cases along with their reasoning and also serves as an example of jurisprudential development during the formative period of Islamic legal schools. The text was mainly preserved through oral transmission and citations in later works, while the original manuscript largely disappeared as it became incorporated into broader school doctrines. A single manuscript was discovered by Abul Wafa al-Afghani and republished in Hyderabad in 1938.