A'lam al-Sunan

A'lam al-Sunan fi Sharh Sahih al-Bukhari (Arabic: أعلام السنن في شرح صحيح البخاري), or simply A'lam al-Sunan, is a classical commentary on Sahih al-Bukhari written by the Shafi'i scholar Al-Khattabi. It is considered the first surviving commentary on Sahih al-Bukhari. Although the author did not assign a formal title, the work became known as A'lam al-Sunan. The commentary was composed to clarify difficult or ambiguous expressions in Sahih al-Bukhari, presenting explanations from a theological perspective. It is comparatively concise in nature, covering 1,238 hadiths from Sahih al-Bukhari.