We were one thousand and four hundred on the Day of Hudaibiya when the Prophet (ﷺ) said to us: Today you are the best people on the earth. And Jabir said: If I had the eyesight, I could show you the place of the tree.
Sahih Muslim Book 33, Hadith 108
← Previous Hadith No! But he offered his prayers at that place, and he administered the oath of fealty nowhere except near the tree in (the plain oo Hudaibiya. Ibn Juraij said that he was informed by Abu Zabair who heard Jabir b. Abdullah say: The Prophet (ﷺ) prayed over the well at Hudaibiya (as a result of which its scanty water rose up and increased so as to be sufficient for the 1400 or 1500 men who had encamped at the place).

Sahih Muslim Book 33, Hadith 107 Next Hadith → I asked Jabir b. 'Abdullah about the number of the Companions (of the Prophet who took the oath of fealty under) the tree. He said: If we were a hundred thousand, it (i. e. the water in the well at Hudaibiya) would have sufficed us, but actually we were one thousand and five hundred.

Sahih Muslim Book 33, Hadith 109