Sayyiduna Abu Huraira (may Allah be pleased with him) narrates: The Noble Prophet (peace and blessings be upon him) said:“Allah Almighty laughs at two persons, one of whom has killed the other, but both will enter Paradise together. One of them was a disbeliever, so he killed the other, then that disbeliever became a Muslim and was also martyred (so he too will enter Paradise).”