Gospel of John - 5:1-17
5 After this there was a ofeast of the Jews, and Jesus went up to Jerusalem.
The feast is unnamed.
Probably the feast is mentioned to explain why Jesus was in Jerusalem again.
There have been excavations of a double pool near the Sheep Gate, that fits the description here.
There are several names associated with the double pool
The best known name is Bethesda.
The most significant feature of the excavation is there are five colonnades.
This would have accommodated a large number of people.
2 Now there is in Jerusalem by pthe Sheep Gate a pool, in Aramaic1 called Bethesda,2 which has five roofed colonnades. 3 In these lay a multitude of invalids—blind, lame, and qparalyzed.3