حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ حَدَّثَنَا لَيْثٌ عَنْ ابْنِ شِهَابٍ عَنْ عُبَيْدِ اللَّهِ بْنِ عَبْدِ اللَّهِ بْنِ عُتْبَةَ عَنْ ابْنِ عَبَّاسٍ أَنَّهُ قَالَ اسْتَفْتَی سَعْدُ بْنُ عُبَادَةَ الْأَنْصَارِيُّ رَسُولَ اللَّهِ صَلَّی اللَّهُ عَلَيْهِ وَسَلَّمَ فِي نَذْرٍ کَانَ عَلَی أُمِّهِ تُوُفِّيَتْ قَبْلَ أَنْ تَقْضِيَهُ فَقَالَ رَسُولُ اللَّهِ صَلَّی اللَّهُ عَلَيْهِ وَسَلَّمَ اقْضِهِ عَنْهَا وَقَالَ بَعْضُ النَّاسِ إِذَا بَلَغَتْ الْإِبِلُ عِشْرِينَ فَفِيهَا أَرْبَعُ شِيَاهٍ فَإِنْ وَهَبَهَا قَبْلَ الْحَوْلِ أَوْ بَاعَهَا فِرَارًا وَاحْتِيَالًا لِإِسْقَاطِ الزَّکَاةِ فَلَا شَيْئَ عَلَيْهِ وَکَذَلِکَ إِنْ أَتْلَفَهَا فَمَاتَ فَلَا شَيْئَ فِي مَالِهِ
صحیح بخاری · Hadith 6958
Allah's Apostle added, "If the owner of camels does not pay their Zakat, then, on the Day of Resurrection those camels will come to him and will strike his face with their hooves." Some people said: Concerning a man who has camels, and is afraid that Zakat will be due so he sells those camels for similar camels or for sheep or cows or money one day before Zakat becomes due in order to avoid payment of their Zakat cunningly! "He has not to pay anything." The same scholar said, "If one pays Zakat of his camels one day or one year prior to the end of the year (by the end of which Zakat becomes due), his Zakat will be valid."