The Prophet (sal Allahu alaihi wa sallam) said: “The person who is hungry or needy but keeps his condition hidden from people has the right on Allah (subhana wa ta’ala) that He provide him with a year’s provision from Halaal wealth.” [Baihaqui]
Miqdad’s wife Dhabaa’a bint Zubair (radi Allahu anhuma) narrated: “People would go to relieve themselves after two or three days (due to poverty because of which they had so little to eat) and their excreta would be like camel droppings. One day Miqdad (radi Allahu anhu) went to an area called Hajba in Baqi al-Gharqad to relieve himself. As he sat down in an uninhabited place to relieve himself, a large mouse brought a gold Dinar from its hole, placed it in front of him and went back into its hole. Then he kept returning, bringing one Dinar after another, until there were a total of seventeen Dinars in front of him.
Miqdad (radi Allahu anhu) took those seventeen Dinars to the Prophet (sal Allahu alaihi wa sallam) and narrated the whole incident to him. The Prophet (sal Allahu alaihi wa sallam) asked: “Did you put your hand inside the mouse hole?” Miqdad (radi Allahu anhu) replied: “No! I swear by the One Who sent you with the truth, I didn’t.” So the Prophet (sal Allahu alaihi wa sallam) said: “(Because you didn’t obtain these Dinars by your own effort, rather Allah sent these to you from His unseen treasure) you do not have to pay Khums on them. May Allah bless these Dinars for you.”
Dhabaa’a (radi Allahu anha) said: “Allah (subhana wa ta’ala) put a lot of blessing (Barakah) in these Dinars and they only finished when I saw sacks full of silver Dirhams in Miqdad’s house.” [Hayatus Sahabah]