Imam Ahmad : 213

قَالَ قَرَأْتُ عَلَى يَحْيَى بْنِ سَعِيدٍ عَنْ زُهَيْرٍ قَالَ حَدَّثَنَا أَبُو إِسْحَاقَ عَنْ حَارِثَةَ بْنِ مُضَرِّبٍ أَنَّهُ حَجَّ مَعَ عُمَرَ بْنِ الْخَطَّابِ رَضِيَ اللَّهُ عَنْهُ فَأَتَاهُ أَشْرَافُ أَهْلِ الشَّامِ فَقَالُوا يَا أَمِيرَ الْمُؤْمِنِينَ إِنَّا أَصَبْنَا مِنْ أَمْوَالِنَا رَقِيقًا وَدَوَابَّ فَخُذْ مِنْ أَمْوَالِنَا صَدَقَةً تُطَهِّرُنَا بِهَا وَتَكُونُ لَنَا زَكَاةً فَقَالَ هَذَا شَيْءٌ لَمْ يَفْعَلْهُ اللَّذَانِ كَانَا مِنْ قَبْلِي وَلَكِنْ انْتَظِرُوا حَتَّى أَسْأَلَ الْمُسْلِمِينَ

He (Ahmd Bin Hambal) said; I read to [Yahya Bin Sa'id] from [Zuhair] he said; Narrated to us [Abu Ishaq] from [Haritsah Bin Mudlarrab] that he performed the Hajj with [Umar Bin Al Khaththab], then the leaders of the people of Syria came to him and said; "O Amirul Mukminin, we have property, slaves and livestock, so take from our property as zakat which can purify us," then Umar answered; "This is something that two people before me have not done but wait until I ask the Muslims.