From Sahih Bukhari (Hadith 6543):
Narrated Sahl bin Sa`d:The Prophet (ﷺ) said, "Seventy-thousand or seven-hundred thousand of my followers (the narrator is in doubt as to the correct number) will enter Paradise holding each other till the first and the last of them enter Paradise at the same time, and their faces will have a glitter like that of the moon at night when it is full
Reference: Bukhari 6543