Following are a number of back-translations as well as a sample translation for translators of Proverbs 25:13:

• Kupsabiny: “A messenger of/with truth makes the master happy like cold water which quenches thirst.” (Source: Kupsabiny Back Translation)
• Newari: “A trustworthy messenger cools the heart of his master
  like cold water at harvest time.” (Source: Newari Back Translation)
• Hiligaynon: “A trustworthy messenger can-make- the feeling -good of the one who sent him, like a cold water on summer-season.” (Source: Hiligaynon Back Translation)
• Kankanaey: “The trustworthy servant, he-can-be-compared-to cold water in the dry-season that strengthens his master.” (Source: Kankanaey Back Translation)
• English: “A messenger who is reliable/tells someone else exactly what he was told to say refreshes the spirits of his bosses who sent him
  like snow/cold water refreshes the ground at the time that people harvest crops.” (Source: Translation for Translators)