ISB ~ John 5 v1

a feast of the Jews:John usually identifies the religious festivals that Jesus attends, whether it is Passover (2:13), Tabernacles (7:2), or Dedication (10:22). Here the unnamed feast may be Pentecost (Weeks), which celebrates the spring harvest as well as the giving of the Torah to Israel. It is one of three pilgrim feasts that required Israelite men to travel to Jerusalem (Deut 16:16; 2 Chron 8:13) (CCC 583).