The Temple code in Roblox Project: Escape Room appears to be 2741. That matches a walkthrough that specifically lists the final code for the Temple section as 2741.

How it’s used

In that guide, the code is the final number you enter after collecting the temple puzzle clues and reaching the throne area. It then unlocks the last wheel/door sequence needed to escape the Temple.

Note

There are also older Temple-related Roblox videos for other games, so if your game is a different Roblox Temple puzzle, the code may be different.