Following are a number of back-translations of 1 John 2:3:

• Uma: «If we follow God’s commands, this is a sign so that we know that we really know him.» (Source: Uma Back Translation)
• Yakan: «We (incl.) are sure that we (dual) know God if we (incl.) follow/obey his commandments.» (Source: Yakan Back Translation)
• Western Bukidnon Manobo: «We (incl.) know that God is our friend if we obey His commands to us.» (Source: Western Bukidnon Manobo Back Translation)
• Kankanaey: «If we are obeying the commands of God, that’s how we definitely know that we know him.» (Source: Kankanaey Back Translation)
• Tagbanwa: «We are sure that we now know God, as long as we are obeying well what he has commanded.» (Source: Tagbanwa Back Translation)
• Tenango Otomi: «If we do what God commands, then we can know for sure that we know God.» (Source: Tenango Otomi Back Translation)
• Yatzachi Zapotec: «But if we do what he commands, we know that we now know him.»
• Eastern Highland Otomi: «If we really do his Word, we take for true that we know God.»
• Tzotzil: «If we obey the commands of God, thus we know that we are his children.» (Source for this and two above: John Beekman in Notes on Translation 12, November 1964, p. 1ff.)
• Candoshi-Shapra: «If we keep His orders, by that it is possible to know ourselves that we have learned (come to know) Jesus.»
• Yanesha’: «If we reserve (keep in remembrance) his word, now of a truth we know of a truth thus how Christ is.»
• Aguaruna: «He who obeys God’s word knows ‘God is surely like that.’ saying,» (Source for this and two above: Mildred Larson in Notes on Translation, July 1965, p. 1-15)