Yet if there is an angel at their side, a messenger, one out of a thousand, sent to tell them how to be upright
NIV
[God's voice may be heard] if there is for the hearer a messenger or an angel, an interpreter, one among a thousand, to show to man what is right for him [how to be upright and in right standing with God]AMP
If there be a messenger with him, an interpreter, one among a thousand, to shew unto man his uprightness:
KJV