Kathir bin Kathir (may Allah have mercy on him) narrates from his father, via his grandfather, who said: I saw the Messenger of Allah (peace and blessings be upon him) praying while people were passing in front of him (peace and blessings be upon him). Sufyan (may Allah have mercy on him) says: I went to Kathir (may Allah have mercy on him) and asked him: "Is this a hadith you narrate from your father?" He said: "I did not hear this hadith from my father; rather, some of my family narrated it to me via my grandfather al-Muttalib."
(b) Ali (may Allah have mercy on him) says: Kathir's saying "I did not hear it from my father" is a serious point against Ibn Jurayj. Abu Sa'id Uthman says: That is, Ibn Jurayj did not preserve it accurately.
(c) The Shaykh (may Allah have mercy on him) says: It has also been reported from Ibn Jurayj, from Kathir, from his father, who said: The notables of Banu al-Muttalib narrated it to me from al-Muttalib. The narration of Ibn Uyaynah is better preserved.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 3482