It is narrated from Sayyiduna Mu'awiyah bin Haydah (may Allah be pleased with him) that he came to the Prophet (peace and blessings be upon him) and said: "O Messenger of Allah, with what has our Lord sent you to us?" He (peace and blessings be upon him) said: "That you worship Allah and do not associate anything with Him, establish the prayer and pay the zakah; and every Muslim is inviolable to every other Muslim. This is your religion; wherever you are, it will suffice you."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17082