The LORD will establish you as His holy people, just as He has sworn to you, if you keep the commandments of the LORD your God and walk in His ways.
KJV
The LORD shall establish thee an holy people unto himself, as he hath sworn unto thee, if thou shalt keep the commandments of the LORD thy God, and walk in his ways.
ASV
Jehovah will establish thee for a holy people unto himself, as he hath sworn unto thee; if thou shalt keep the commandments of Jehovah thy God, and walk in his ways.