Allah, the All-Wise says: "Friends on that Day will be enemies one to another, except al-Muttaqoon (i.e. those who have Taqwah)." [43:67]
Hafidh Ibn Katheer, commenting on this verse, relates a story on the authority of Ali Ibn Abi Talib (radiyallahou Anhou) and says that any friendship for other than Allah is turned into enmity, except what was in it for Allah the Mighty and Majestic: Two who are friends for Allah's sake; one of them dies and is given good news that he will be granted al-Jannah, so he remembered his friend and he supplicated for him, saying: O Allah, my friend used to command me to obey You and to obey Your Prophet (sallalahou Alayhi wasallam) and used to command me to do good and to forbid me from doing evil. And he told me that I will meet You. O Allah, do not let him go astray after me, until you show him what you have just shown me, until You are satisfied with him, just like You are satisfied with me." So he is told: "Had you known what is (written) for you friend, would you have laughed a lot and cried a little." Then his friend dies and their souls are gathered, and both are asked to express their opinions about each other. So each one of them says to his friend: you were the best brother, the best companion and the best friend." And when on of the two disbelieving friends dies, and he is given tidings of Hellfire, he remembered his friend and he said: O Allah, my friend used to order me to disobey You and disobey Your Prophet, and commanded me to do evil, and forbade me from doing good, and told me that I would not meet You. O Allah, do not guide him after me, until you show him what you have just shown me and until you are dissatisfied with him just like You are dissatisfied with me." Then the other disbelieving friend dies, and their souls are gathered, and both are asked to give their opinions about each other. So each one says to his friend: you were the worst brother, the worst companion and the worst friend."
