Yahya related to me from Malik from Nafi that Abdullah ibn Umarsaid, "If someone breaks an oath which he has stressed, he has to freea slave, or clothe ten poor people. If someone breaks an oath, but hasnot stressed it, he only has to feed ten poor people and each poorperson is fed a mudd of wheat. Some one who does not have the meansfor that, should fast for three days."
USC-MSA web (English) reference: Book 22, Hadith 12
Arabic reference: Book 22, Hadith 1024