Mukhtasar Muslim

´Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) says that` when this verse was revealed: "Those who believe and do not mix their belief with injustice (i.e., do not get involved in sin), for them is security and they are the rightly guided," it was very difficult for the companions of the Messenger of Allah (peace and blessings be upon him). They said, "O Messenger of Allah! Who among us does not wrong himself (i.e., commit sin)?" So the Messenger of Allah (peace and blessings be upon him) said, "This verse does not mean what you think. Rather, by 'injustice' is meant what Luqman (peace be upon him) said to his son: 'O my son! Do not associate anything with Allah; indeed, associating partners with Allah is a great injustice.'" (Luqman: 13)