EZK 46:2

2 And the Nasi shall enter by the derech ulam haSha'ar from without, and shall stand by the mezuzat HaSha'ar, and the Kohanim shall prepare his Olah [(burnt offering)] and his Shelamim, and he shall worship at the threshold of the Sha'ar; then he shall go out; but the Sha'ar shall not be shut until the erev.