וְאַ֨ךְ אֶת־דִּמְכֶ֤ם לְנַפְשֹֽׁתֵיכֶם֙ אֶדְרֹ֔שׁ מִיַּ֥ד כָּל־חַיָּ֖ה אֶדְרְשֶׁ֑נּוּ וּמִיַּ֣ד הָֽאָדָ֗ם מִיַּד֙ אִ֣ישׁ אָחִ֔יו אֶדְרֹ֖שׁ אֶת־נֶ֥פֶשׁ הָֽאָדָֽם׃
און פֿאַר װאָר, אײַער בלוט, פֿון אײַערע נפֿשות, װעל איך אױפֿמאָנען; פֿון דער האַנט פֿון איטלעכער חיה װעל איך עס אױפֿמאָנען, און פֿון דער האַנט פֿון דעם מענטשן, פֿון דער האַנט פֿון דעם מענטשן זײַן ברודער, װעל איך אױפֿמאָנען דאָס לעבן פֿון אַ מענטשן.
Rashi
ואך את דמכם HOWEVER YOUR BLOOD — Although I have permitted you to take the life of cattle yet your blood I will surely require from him amongst you who sheds his own blood (see Bava Kamma 91b).
Bekhor Shor
But (ach) your blood of your lives will I require: Because it permitted to spill the blood of beasts, it forbade the spilling of the blood of man, even one's own blood. [This is] so that they will not say, "Is it not that [since] the blood of a beast is permitted for us to spill because they live through us, [so] too a man who lives through himself should be permitted to kill himself? Hence it is stated, "of your lives I will require"...
Chizkuni
ואך את דמכם, “yet your (human) blood”, etc; this is a warning to any animal not to kill any human being, as G-d would hold it responsible for harming humans. Rashi explains the verse as follows: the peculiar wording is to include killing, including suicide that does not involve the actual shedding of blood, such as by strangulation.