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Narrated Jabir bin `Abdullah: On the day of Al-Hudaibiya, Allah's Messenger (ﷺ) 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 we gave the Pledge of Allegiance)." Salim said, "Our number was 1400."
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا عَلِيٌّ، حَدَّثَنَا سُفْيَانُ، قَالَ عَمْرٌو سَمِعْتُ جَابِرَ بْنَ عَبْدِ اللَّهِ ـ رضى الله عنهما ـ قَالَ قَالَ لَنَا رَسُولُ اللَّهِ صلى الله عليه وسلم يَوْمَ الْحُدَيْبِيَةِ " أَنْتُمْ خَيْرُ أَهْلِ الأَرْضِ ". وَكُنَّا أَلْفًا وَأَرْبَعَمِائَةٍ، وَلَوْ كُنْتُ أُبْصِرُ الْيَوْمَ لأَرَيْتُكُمْ مَكَانَ الشَّجَرَةِ. تَابَعَهُ الأَعْمَشُ سَمِعَ سَالِمًا سَمِعَ جَابِرًا أَلْفًا وَأَرْبَعَمِائَةٍ.
sunnah.com