Deuteronomy 25:15
You shall have a perfect and just weight. You shall have a perfect and just measure, that your days may be long in the land which the LORD your God gives you.
World English Bible (Public Domain)
In context
Before · Deuteronomy 25:13–14
13You shall not have in your bag diverse weights, one heavy and one light. 14You shall not have in your house diverse measures, one large and one small.
15You shall have a perfect and just weight. You shall have a perfect and just measure, that your days may be long in the land which the LORD your God gives you.