Abu Zubayr reported,

He heard Jabir being asked, "How many were you on the day of Hudaybiyyah?"Jabir replied, "We were one thousand four hundred. We pledged allegiance to him while Umar held his hand beneath the tree, which was a Samura tree. All of us pledged allegiance to him except Jadd bin Qays al-Ansari, who hid himself under the belly of his camel."

Azami 8993

Sahih

عن أبي الزبير

أنه سمع جابرا يسأل: كم كانوا يوم الحديبية؟ قال: كنا أربع عشرة مائة فبايعناه وعمر أخذ بيده تحت الشجرة. وهي سمرة، فبايعناه غير جد بن قيس الأنصاري اختبأ تحت بطن بعيره.

الأعظمي 8993صحيح
Contents
Reference
Commentary
Ayat
Collection
Jami al-Kamil
Book
Biography of the Prophet ﷺ
Chapter
Expedition of Hudaybiya and expedition of Dhat al-Qarad
Section
Hypocrite who did not give the pledge of allegiance
Numbering
Jami al-Kamil 8993 (2nd edition)
Azami 8993