en_tn/lev/16/19.md

to cleanse it

The altar being fit to be used for God's purposes is spoken of as if it were physically clean. (See: rc://en/ta/man/translate/figs-metaphor)

set it apart to Yahweh, away from the unclean actions of the people of Israel

The altar being dedicated to Yahweh is spoken of as if it were physically separated from the sins of the people. (See: rc://en/ta/man/translate/figs-metaphor)

the unclean actions

Sinful actions which make people unacceptable to Yahweh are spoken of as if they were physically unclean actions. (See: rc://en/ta/man/translate/figs-metaphor)