Sahih Bukhari · Hadith 4207

حدثنا علي، حدثنا سفيان، قال عمرو سمعت جابر بن عبد الله رضى الله عنهما قال قال لنا رسول الله صلى الله عليه وسلم يوم الحديبية ‏"‏ أنتم خير أهل الأرض ‏"‏‏.‏ وكنا ألفا وأربعمائة، ولو كنت أبصر اليوم لأريتكم مكان الشجرة‏.‏ تابعه الأعمش سمع سالما سمع جابرا ألفا وأربعمائة‏.‏

Narrated Jabir bin `Abdullah: On the day of Al-Hudaibiya, Allah's Apostle said to us' "You are the best people on the earth!" We were 1400 then. If I could see now, I would have shown you the place of the Tree (beneath which the Pledge of allegiance was given by us)," Salim said, "Our number was 1400." `Abdullah bin Abi `Aufa said, "The people (who gave the Pledge of allegiance) under the Tree numbered 1300 and the number of Bani Aslam was 1/8 of the Emigrants."

Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).