Sayyiduna Ma'qil bin Yasar (may Allah be pleased with him) said: "We gave our pledge of allegiance to the Messenger of Allah (peace and blessings be upon him) on the day of al-Hudaybiyah while I was holding a branch of the tree away from his (peace and blessings be upon him) face. We pledged to him that we would not flee, and we did not pledge to him unto death." We asked him: How many were you? He said: One thousand four hundred.
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17664