al-Istibsar (Arabic: ٱلِٱسْتِبْصَار فِيمَا ٱخْتُلِفَ مِن ٱلْأَخْبَار, romanized: al-Istibṣār fī-mā ukhtulifa min al-Akhbār, lit. 'Reflection Upon The Disputed Traditions') is the fourth hadith collection of the Four Books of Shia Islam. it was compiled by Persian scholar al-Tusi It includes the same subjects as Tahdhib al-Ahkam (Rectification of the Statutes) but in a shorter form. Source: Wikipedia (en)