|Original title||الاستبصار فی ما اختلف من الاخبار|
|Publisher||Mu'assisa al-a'lami li l-matbu'at|
Al-Istibṣār fī mā ukhtulif min al-akhbār (Arabic: الاستِبصار فی ما اختُلِفَ مِن الاَخبار) is the fourth book of the Four Books. It is a hadith collection compiled by al-Shaykh al-Tusi (d. 460/1067 ) known as al-Shaykh al-Ṭa'ifa.
This book contains jurisprudential hadiths and it is more concise than Tahdhib al-ahkam. The order of the chapters in al-Istibsar is so that the first two parts are dedicated to issues regarding worship (except Jihad) and the last part (part three) is about other jurisprudential issues such as contracts, unilateral obligations, fixed punishments and financial compensations.
According to statistics that the author has given about the hadiths recorded in al-Istibsar, they are 5511 hadiths, while in a researched publication of the book, the number of hadiths are 5558 and this difference might be due to the way of counting some special hadiths.
In the first two parts, al-Shaykh al-Tusi has recorded almost all hadiths with their references, but in the last part, the references are mentioned in a brief way and simi