Abd al-Rahman bin Ka'b bin Malik narrates: I used to lead my father (Ka'b bin Malik, may Allah be pleased with him) to the mosque after his sight was gone. Whenever he heard the call to the Friday prayer, he would pray for mercy for As'ad bin Zurarah (may Allah be pleased with him). I asked: "O my dear father! Why is it that whenever you hear the call to the Friday prayer, you pray for mercy for As'ad bin Zurarah (may Allah be pleased with him)?" He said: "He was the first person who led us in the Friday prayer in Hazm al-Nabit, the settlement of Banu Bayadah in the area of Naqi', (a place) which is called al-Khadamat." I asked: "How many of you were there that day?" He said: "Forty men."
When Muhammad bin Ishaq states that he heard the narration directly and the narrator is trustworthy, the chain is sound; this hadith has a hasan (good) chain and is sahih (authentic). Another hadith has also been narrated on this subject, but one like it is not used as proof.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجمعة / 5606