خمر بلاش القاضي يشربه

An Omani proverb from the Sablat Oman Forums:


  خمر بلاش القاضي يشربه 
(khamer bilash alqadi yeshurba)
Literal meaning:The free alcohol is taken even by the judge.
Meaning: Even the professionally honest can give in to temptation. In English you might say "Every man has his price"