Battles (Kitab Al-Malahim)
Dawud :: Book 37 : Hadith 4331
Narrated Amirah al-Kindi:
The Prophet (peace_be_upon_him) said: When sin is done in the earth, he who sees it and disapproves of it will be taken like one who was not present, but he who is not present and approves of it will be like him who sees.