Following are a number of back-translations as well as a sample translation for translators of 1 Chronicles 29:18:

• Kupsabiny: “Oh, God of our grandfathers Abraham, Isaac and Jacob, cause all your people to obey you and let them always dedicate themselves to you.” (Source: Kupsabiny Back Translation)
• Newari: “Oh LORD, you are the God of our ancestors, Abraham, Isaac, and Israel. Cause your subjects always to have this desire in [their] hearts and draw their hearts towards you.” (Source: Newari Back Translation)
• Hiligaynon: “‘O LORD, the God of our (excl.) ancestors Abraham, Isaac, and Jacob, may you (sing.) always keep[lit. place/put] this desire in the hearts of your (sing.) people, and help them that (they) will-be-faithful to you (sing.).” (Source: Hiligaynon Back Translation)
• English: “Yahweh, the God whom our ancestors Abraham, Isaac, and Jacob worshiped,
  I desire/hope that your people will continue to desire to do things like this forever,
  and that they will always be loyal to you.” (Source: Translation for Translators)