How do we know who is our real friends and who is not? Here are some verses that helps us to know who are our REAL FRIENDS. Don't forget it is our responsibility to pick our friends well
[002:257] Allah is the friend and patron of those who believe. He brings them out of the depths of darkness into light. While those who do not believe, have the forces of evil as their friends; they lead them out of light, into the very depths of darkness. Such ones shall be the inmates of the fire. They will stay there forever.
[003:028] The believers should not take as friends the unbelievers in preference to the believers _ unless they sense (and suspect) harm (and harassment) from the unbelievers. Whoever does that shall have nothing from Allah at all. Allah cautions you to beware of Him! Towards Allah is your final destination.
[004:089] The hypocrites wish that you would reject faith just like they have. Then, you will (descend down to their level and) be equal to them. Therefore, do not choose them as friends unless they (emigrate and) leave their homes in the path of Allah. If they revert (to open hostility), then seize and slay them wherever you see them. Do not take them as friends or protectors, nor as helpers,
[005:057] Oh you who believe! Do not accept as your friends those who mock your faith and treat it as a joke, whether they are among those given the book before you (the Christians and the Jews), or other unbelievers. Fear Allah (exclusively) if you really are the believers.
[007:027] Oh children of Adam! Do not let Shaitan entice you as he did your (primordial) parents when he got them expelled from paradise. He stripped them of their clothes, in order to expose their nakedness to them. Of course, Shaitan and his tribe watch you from where you cannot see them. Of course, We let the Shaitans be the friends of those who do not believe.
[010:062] Beware! The friends of Allah shall have no fear; nor shall they ever grieve (or be sorry).
[060:009] But Allah forbids you to befriend those who fought against you over matters of faith, those who either assisted others in driving you out of your homes or drove you out themselves. Those of you who befriend them are indeed the evil doers.
[005:055] Your (real) friends are (no less than) God, His Apostle, and the (fellowship of) believers,- those who establish regular prayers and regular charity, and they bow down humbly (in worship).
SAHIH MUSLIM, BOOK 1: The Book of Faith (Kitab Al-Iman) Book 001, Number 0417:
'Amr b. 'As reported: I heard it from the Messenger of Allah (may peace be upon him) quite audibly and not secretly: Behold! the posterity of my fathers, that is, so and so, are not my friends. Verily Allah and the pious believers are my friends.
A person is likely to follow the faith of his friend, so look at whom you befriend. ~Abu Dawood and at-Tirmidhee ~
"Friends on that Day will be enemies one to another, except al-Muttaqoon (i.e. those who have Taqwah)." [43:67]