Deuteronomy 12:16

12:16 However, you must not eat blood – pour it out on the ground like water.

Deuteronomy 12:23-25

12:23 However, by no means eat the blood, for the blood is life itself ¹  – you must not eat the life with the meat! 12:24 You must not eat it! You must pour it out on the ground like water. 12:25 You must not eat it so that it may go well with you and your children after you; you will be doing what is right in the Lord’s sight. ² 

[12:23]  ¹ sn The blood is life itself. This is a figure of speech (metonymy) in which the cause or means (the blood) stands for the result or effect (life). That is, life depends upon the existence and circulation of blood, a truth known empirically but not scientifically tested and proved until the 17th century a.d. (cf. Lev 17:11).

[12:25]  ² tc Heb “in the eyes of the Lord.” The LXX adds “your God” to create the common formula, “the Lord your God.” The MT is preferred precisely because it does not include the stereotyped formula; thus it more likely preserves the original text.