Following are a number of back-translations as well as a sample translation for translators of Isaiah 66:5:

• Kupsabiny: “Hear the word of God you (plur.) who
  tremble on account of his word.
  God is saying,
  ‘Your people who are your relatives hate you,
  they do not want you because you worship me.
  (They) say,
  ‘Please let your God show his power
  so that we can see when he will make you happy.’
  But they themselves are the ones who will be shamed.” (Source: Kupsabiny Back Translation)
• Newari: “Any among you who fear the word of the LORD,
  hear his word, "Your own people,
  any who hate you, any who do not love you by reason of me,
  They mock you and say, ‘May the LORD be glorified,
  then we will see your joy.’
  But they will fall into shame.” (Source: Newari Back Translation)
• Hiligaynon: “You (plur.) who are afraid/scare of the word of the LORD, listen to his word: ‘Because you (plur.) are faithful to me, some of your (plur.) fellowmen are-hating and are-rejecting you (plur.). They mock you (plur.) saying, ‘Let- the LORD -show his power so-that we (excl.) can-see your (plur.) happiness!’ ’ But they will-be-put-to-shame.” (Source: Hiligaynon Back Translation)