It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: How excellent is that slave who fulfills the rights of both Allah and his master. Ka'b added from his own side that Allah and His Messenger have spoken the truth; there will be no reckoning for him and for the believer who is indifferent to the world.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 9069