From Sahih Bukhari (Hadith 6583):
Narrated Abu Hazim from Sahl bin Sa`d:The Prophet (ﷺ) said, "I am your predecessor (forerunner) at the Lake-Fount, and whoever will pass by there, he will drink from it and whoever will drink from it, he will never be thirsty. There will come to me some people whom I will recognize, and they will recognize me, but a barrier will be placed between me and them
Reference: Bukhari 6583