Hadith
حَدَّثَنَا أُمَيَّةُ بْنُ بِسْطَامٍ، حَدَّثَنَا يَزِيدُ بْنُ زُرَيْعٍ، حَدَّثَنَا رَوْحُ بْنُ الْقَاسِمِ، عَنْ إِسْمَاعِيلَ بْنِ أُمَيَّةَ، عَنْ يَحْيَى بْنِ عَبْدِ اللَّهِ بْنِ صَيْفِيٍّ، عَنْ أَبِي مَعْبَدٍ، عَنِ ابْنِ عَبَّاسٍ ـ رضى الله عنهما أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم لَمَّا بَعَثَ مُعَاذًا ـ رضى الله عنه ـ عَلَى الْيَمَنِ قَالَ " إِنَّكَ تَقْدَمُ عَلَى قَوْمٍ أَهْلِ كِتَابٍ، فَلْيَكُنْ أَوَّلَ مَا تَدْعُوهُمْ إِلَيْهِ عِبَادَةُ اللَّهِ، فَإِذَا عَرَفُوا اللَّهَ فَأَخْبِرْهُمْ أَنَّ اللَّهَ قَدْ فَرَضَ عَلَيْهِمْ خَمْسَ صَلَوَاتٍ فِي يَوْمِهِمْ وَلَيْلَتِهِمْ، فَإِذَا فَعَلُوا، فَأَخْبِرْهُمْ أَنَّ اللَّهَ فَرَضَ عَلَيْهُمْ زَكَاةً {تُؤْخَذُ} مِنْ أَمْوَالِهِمْ وَتُرَدُّ عَلَى فُقَرَائِهِمْ، فَإِذَا أَطَاعُوا بِهَا فَخُذْ مِنْهُمْ، وَتَوَقَّ كَرَائِمَ أَمْوَالِ النَّاسِ ".
Narrated Ibn `Abbas:When Allah's Messenger (ﷺ) sent Mu`adh to Yemen, he said (to him), "YOU are going to people of a (Divine) Book. First of all invite them to worship Allah (alone) and when they come to know Allah, inform them that Allah has enjoined on them, five prayers in every day and night; and if they start offering these prayers, inform them that Allah has enjoined on them, the Zakat. And it is to be taken from the rich amongst them and given to the poor amongst them; and if they obey you in that, take Zakat from them and avoid (don't take) the best property of the people as Zakat
Sahih
Sahih al-Bukhari 1458 ·Book 24, Hadith 60·Also available on sunnah.com·