It was narrated that Ibn 'Abbas said:
"A man would give his family food that was abundant and another would give his family food that was barely sufficient, then the following was revealed: 'With the Awsat of that with which you feed your families...'"(2) (RU)
English reference (RU): Vol. 3, Book 11, Hadith 2113 (RU)
Arabic reference (RU): Book 11, Hadith 2191 (RU)