Deuteronomy 25:13

New English Translation

¹³You must not have in your bag different stone weights,^[a] a heavy and a light one.^[b]

Deuteronomy 25:13 tn Heb “a stone and a stone.” The repetition of the singular noun here expresses diversity, as the following phrase indicates. See IBHS 116 §7.2.3c.
Deuteronomy 25:13 tn Heb “a large and a small,” but since the issue is the weight, “a heavy and a light one” conveys the idea better in English.

New English Translation (NET)