وَحَدَّثَنِي مَالِكٌ، عَنِ الْعَلاَءِ بْنِ عَبْدِ الرَّحْمَنِ، عَنْ مَعْبَدِ بْنِ كَعْبٍ السَّلَمِيِّ، عَنْ أَخِيهِ عَبْدِ اللَّهِ بْنِ كَعْبِ بْنِ مَالِكٍ الأَنْصَارِيِّ، عَنْ أَبِي أُمَامَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏"‏ مَنِ اقْتَطَعَ حَقَّ امْرِئٍ مُسْلِمٍ بِيَمِينِهِ حَرَّمَ اللَّهُ عَلَيْهِ الْجَنَّةَ وَأَوْجَبَ لَهُ النَّارَ ‏"‏ ‏.‏ قَالُوا وَإِنْ كَانَ شَيْئًا يَسِيرًا يَا رَسُولَ اللَّهِ قَالَ ‏"‏ وَإِنْ كَانَ قَضِيبًا مِنْ أَرَاكٍ وَإِنْ كَانَ قَضِيبًا مِنْ أَرَاكٍ وَإِنْ كَانَ قَضِيبًا مِنْ أَرَاكٍ ‏"‏ ‏.‏ قَالَهَا ثَلاَثَ مَرَّاتٍ ‏.‏

Malik related to me from al-Ala ibn Abd ar-Rahman from Mabad ibnKab as-Salami from his brother Abdullah ibn Kab ibn Malik al-Ansarifrom Abu Umama that the Messenger of Allah, may Allah bless him andgrant him peace, said, "Whoever cuts off the right of a muslim man byhis oath, Allah forbids him the Garden and obliges the Fire for him."They said, "Even if it is something insignificant, Messenger ofAllah?" He said, "Even if it is a tooth-stick, even if it is a tooth-stick," repeating it three times. Translation Not Available

Book Ref: Muwatta Imam Malik Book 36 Hadith 1415
Web Ref:  Muwatta Imam Malik Book 36 Hadith 11