Sahih Muslim Book - 1, Hadith - 121

حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ وَأَبُو كُرَيْبٍ وَإِسْحَاقُ بْنُ إِبْرَاهِيمَ جَمِيعًا عَنْ وَكِيعٍ قَالَ أَبُو بَكْرٍ حَدَّثَنَا وَكِيعٌ عَنْ زَكَرِيَّاءَ بْنِ إِسْحَاقَ قَالَ حَدَّثَنِي يَحْيَى بْنُ عَبْدِ اللَّهِ بْنِ صَيْفِيٍّ عَنْ أَبِي مَعْبَدٍ عَنْ ابْنِ عَبَّاسٍ عَنْ مُعَاذِ بْنِ جَبَلٍ قَالَ أَبُو بَكْرٍ رُبَّمَا قَالَ وَكِيعٌ عَنْ ابْنِ عَبَّاسٍ أَنَّ مُعَاذًا قَالَ بَعَثَنِي رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَقَالَ إِنَّكَ تَأْتِي قَوْمًا مِنْ أَهْلِ الْكِتَابِ فَادْعُهُمْ إِلَى شَهَادَةِ أَنْ لَا إِلَهَ إِلَّا اللَّهُ وَأَنِّي رَسُولُ اللَّهِ فَإِنْ هُمْ أَطَاعُوا لِذَلِكَ فَأَعْلِمْهُمْ أَنَّ اللَّهَ افْتَرَضَ عَلَيْهِمْ خَمْسَ صَلَوَاتٍ فِي كُلِّ يَوْمٍ وَلَيْلَةٍ فَإِنْ هُمْ أَطَاعُوا لِذَلِكَ فَأَعْلِمْهُمْ أَنَّ اللَّهَ افْتَرَضَ عَلَيْهِمْ صَدَقَةً تُؤْخَذُ مِنْ أَغْنِيَائِهِمْ فَتُرَدُّ فِي فُقَرَائِهِمْ فَإِنْ هُمْ أَطَاعُوا لِذَلِكَ فَإِيَّاكَ وَكَرَائِمَ أَمْوَالِهِمْ وَاتَّقِ دَعْوَةَ الْمَظْلُومِ فَإِنَّهُ لَيْسَ بَيْنَهَا وَبَيْنَ اللَّهِ حِجَابٌ.

It was narrated from Ibn 'Abbas that Mu'adh said: "The Messenger of Allah (s.a.w) sent me and said: 'You are going to some of the People of the Book. Call them to bear witness that none has the right to be worshiped but Allah, and that I am the Messenger of Allah. If they accept that, then teach them that Allah has enjoined on them five prayers to be offered each day and night. If they accept that, then teach them that Allah has enjoined on them charity (Zakat) to be taken from their rich and given to their poor. If they accept that, then beware (of taking) the best of their wealth, and protect yourself from the supplication of the one who has been wronged, for there is no barrier between it and Allah."