en_tn/ezk/09/05.md

he spoke to the others within my hearing

The word "others" refers to the guards. (See: Ezekiel 9:1)

Do not let your eyes have compassion

"Do not have compassion on the people you see."

do not spare

"do not refrain from killing"

mark on his head

These were the people who groaned about the abominations happening in Jerusalem. See how you translated "mark" in Ezekiel 9:3.

Begin at my sanctuary

"Begin to kill the ones who do not have the mark at my sanctuary" (See: rc://en/ta/man/translate/figs-explicit)