Verses 1-2 give background information for the events that follow. Verse 1 tells where they took place, and verse 2 gives background information about Judas. (See: [[rc://en/ta/man/jit/writing-background]])
This was a low place in Jerusalem separating the Temple Mount from the Mount of Olives. It has a small stream in it only after heavy rains. Many modern English translations read, "the Kidron Valley" (See: [[rc://en/ta/man/jit/translate-names]])