Hadithcore
Riyad as-Salihin, 208

Mu'adh (May Allah bepleased with him) reported that Messenger of Allah (ﷺ) sent me (as a governor of Yemen) and instructed me thus:

"You will go to the people of the Book. First call them to testify that 'there is no true god except Allah, that I am (Muhammad (ﷺ)) the Messenger of Allah.' If they obey you, tell them that Allah has enjoined upon them five Salat (prayers) during the day and night; and if they obey you, inform them that Allah has made Zakat obligatory upon them; that it should be collected from their rich and distributed among their poor; and if they obey you refrain from picking up (as a share of Zakat) the best of their wealth. Beware of the supplication of the oppressed, for there is no barrier between it and Allah". <b>[Al-Bukhari and Muslim]</b>.

وعن معاذ رضي الله عنه قال ‏:‏ بعثني رسول الله صلى الله عليه وسلم فقال‏:‏ ‏

‏إنك تأتي قومًا من أهل الكتاب، فادعهم إلى شهادة أن لا إله إلا الله، وأني رسول الله ، فإن هم أطاعوا لذلك، فأعلمهم أن الله قد افترض عليهم خمس صلوات في كل يوم وليلة، فإن هم أطاعوا لذلك، فإياك وكرائم أموالهم‏.‏ واتق دعوة المظلوم فإنه ليس بينها وبين الله حجاب‏

‏ ‏(‏‏(‏متفق عليه‏)‏‏)‏ ‏.‏

References1 variant
In-Book Reference
Introduction, Hadith 208
Sharh · explanationclick to expand
<b>Guidance from the Hadith:</b><br> 1) The first thing people should be called to is to testify that there is no god but Allah. Believing in the oneness of Allah (Tawhid) is the foremost duty upon the slaves.<br> 2) Prayer and Zakah are of utmost importance, being the most superior pillars of Islam after the two testimonies of faith.<br> 3) Injustice is prohibited, and so it is impermissible for the collector of Zakah to take more than what is due.<br> 4) The supplication of the oppressed is answered, whether he is a Muslim or a disbeliever, because Allah Almighty has prohibited injustice among the slaves.
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