He that speaks truth must have one foot in the stirrup.

Related:

• He who speaks the truth must have one foot in the stirrup.
  Armenian...
• If you speak the truth, keep a foot in the stirrup.
  Turkish...
• A man about to speak the truth should keep one foot in the stirrup.
  Old Mongolian...
• Two watermelons can not be held under one arm.
  Turkish...
• A thousand regrets do not cancel one debt.
  Turkish...
• When the ax entered the forest, the trees said, "The handle is one of us!" -
  Turkish...
• A liar isn't believed even when he speaks the
  truth...
• Measure a thousand times and cut once. --
  Turkish...