It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) said: "I do not ask you for any reward for the clear proofs and guidance that I have brought you, except that you love Allah and draw near to Him through obedience to Him."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11098