Sayyiduna Jarir (may Allah be pleased with him) said: I said: "O Messenger of Allah, take my pledge and set the conditions for me, for you know best." So he (peace and blessings be upon him) extended his hand and took my pledge, and said: "Do not associate anything with Allah, establish the prayer, pay the zakah, act sincerely towards the Muslim, and separate yourself from the disbeliever."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 2302