Exodus 20:16 New English Translation

¹⁶“You shall not give^[a] false testimony^[b] against your neighbor.

Exodus 20:16 tn Heb “answer” as in a court of law.
Exodus 20:16 tn The expression עֵד שָׁקֶר (ʿed shaqer) means “a lying witness” (B. S. Childs, Exodus [OTL], 388). In this verse the noun is an adverbial accusative, “you will not answer as a lying witness.” The prohibition is against perjury. While the precise reference would be to legal proceedings, the law probably had a broader application to lying about other people in general (see Lev 5:1; Hos 4:2).

New English Translation (NET)