«الشَّهْرُ تِسْعٌ وَعِشْرُونَ»
The month may consist of twenty-nine days.
Al-Shafi‘i transmits the report through al-Shafi‘i ← Malik ← ‘Abd Allah b. Dinar ← ‘Abd Allah b. ‘Umar. Its subject is the obligation to begin and end the fasting period on sighting the crescent, with guidance for a clouded sky or an obscured crescent.
The specific issue is an apparent uniqueness of al-Shafi‘i's transmission from Malik, not a claim that the entire legal teaching occurs in only one chain. Investigators must specify the narrator, the teacher, and the exact wording alleged to be unique.