Abu Dawud Book 13, Hadith Number 3081.

Narated By Duba’ah daughter of az-Zubayr ibn AbdulMuttalib : Al-Miqdad went to Baqi’ al-Khabkhabah for a certain need. He found a mouse taking out a dinar from a hole. It then continued to take out dinars one by one until it took out seventeen dinars. It then took out a red purse containing a dinar. There were thus eighteen dinars. He took them to the Prophet (PBUH), informed him and said to him: Take its sadaqah. The Prophet (PBUH) asked him: Did you extend your hand toward the hole? He replied: No. The Apostle of Allah (PBUH) then said: May Allah bless you in it.