حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ، أَنَّهُ كَانَ يَقُولُ مَنْ حَلَفَ بِيَمِينٍ فَوَكَّدَهَا ثُمَّ حَنِثَ فَعَلَيْهِ عِتْقُ رَقَبَةٍ أَوْ كِسْوَةُ عَشَرَةِ مَسَاكِينَ وَمَنْ حَلَفَ بِيَمِينٍ فَلَمْ يُؤَكِّدْهَا ثُمَّ حَنِثَ فَعَلَيْهِ إِطْعَامُ عَشَرَةِ مَسَاكِينَ لِكُلِّ مِسْكِينٍ مُدٌّ مِنْ حِنْطَةٍ فَمَنْ لَمْ يَجِدْ فَصِيَامُ ثَلاَثَةِ أَيَّامٍ ‏.‏

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." Translation Not Available

Book Ref: Muwatta Imam Malik Book 22 Hadith 1024
Web Ref:  Muwatta Imam Malik Book 22 Hadith 12