Following are a number of back-translations as well as a sample translation for translators of Isaiah 40:6:

• Kupsabiny: “There is a voice that is saying, ‘Shout.’
  I asked, ‘What news shall I shout?’
  I was told, ‘All people are like grass,
  and their faith is short lived/weak like the life of flowers.
  Grass will dry
  and flowers shall fall.” (Source: Kupsabiny Back Translation)
• Newari: “A voice spoke like this, "Proclaim the word!"
  Then I asked, "What word should I proclaim?"
  "All people are just like grass,
  their glory is like the wildflowers that live only a short time.” (Source: Newari Back Translation)
• Hiligaynon: “Someone said to me, ‘You (sing.) preach!’ I replied, ‘What I am going to preach?’ He said, ‘Preach that all the people are like grass, and their greatness are like its flower.” (Source: Hiligaynon Back Translation)