en_tn/lev/01/09.md

But its inner parts and its legs he must wash with water

The person would do this before giving the pieces to the priests to place on the altar. You can state this at the end of Leviticus 1:6.

inner parts

This is the stomach and intestines.

he must wash

Here "he" refers to the one making the offering.

It will produce a sweet aroma for me

Yahweh being pleased with the sincere worshiper offering the sacrifice is spoken of as if Yahweh were pleased by the aroma of the burning sacrifice. (See: rc://en/ta/man/translate/figs-metaphor)

an offering made to me by fire

Yahweh is telling Moses that the offerings are to be burnt with fire. This can be stated in active form. AT: "a burnt offering to me" (See: rc://en/ta/man/translate/figs-activepassive)