Deuteronomy 6:13

13 Thou shalt fear the LORD thy God, and serve Him, and shalt swear by His name.

Deuteronomy 6:13 In-Context

11 and houses full of all good things which thou filled not, and wells dug which thou dug not, vineyards and olive trees which thou planted not, when thou shalt have eaten and be full,
12 then beware lest thou forget the LORD who brought thee forth out of the land of Egypt, from the house of bondage.
13 Thou shalt fear the LORD thy God, and serve Him, and shalt swear by His name.
14 Ye shall not go after other gods, of the gods of the people who are round about you
15 (for the LORD thy God is a jealous God among you), lest the anger of the LORD thy God be kindled against thee, and destroy thee from off the face of the earth.
Third Millennium Bible (TMB), New Authorized Version, Copyright 1998 by Deuel Enterprises, Inc., Gary, SD 57237. All rights reserved.