Making the land unacceptable to Yahweh is spoken of as if it were physically polluting the land. Alternate translation: "Do not make the land where you live unacceptable to me in this way, because blood from murder makes the land unacceptable to me" (See: [[rc://en/ta/man/translate/figs-metaphor]])
This double negative emphasizes that the blood of the one who sheds blood is the only thing that can make atonement for the land. Alternate translation: "The only atonement that can be made for the land when blood has been shed on it is the blood of the one who shed it" (See: [[rc://en/ta/man/translate/figs-doublenegatives]])
# when blood has been shed
This refers to when a person intentionally kills another person. This can be stated in active form. Alternate translation: "when someone has shed blood" or "when someone has intentionally killed another person" (See: [[rc://en/ta/man/translate/figs-activepassive]])