Q 27: What is the textual proof that one should make friends and declare enmity only for Allah's Sake?

{O you who believe! Take not the Jews and the Christians as Auliya' (friends, protectors, helpers), they are but Auliya' of each other. And if any amongst you takes them (as Auliya'), then surely he is one of them. Verily, Allah guides not those people who are the Zalimun (polytheists and wrong-doers and unjust). And you see those in whose hearts there is a disease (of hypocrisy), they hurry to their friendship, saying: "We fear lest some misfortune of a disaster may befall us." Perhaps Allah may bring a victory or a decision according to His Will. Then they will become regretful for what they have been keeping as a secret in themselves. And those who believe will say: “Are these the men (hypocrites) who swore their strongest oaths by Allah that they were with you (Muslims)?" All that they did has been in vain (because of their hypocrisy), and they have become the losers. O you who believe! Whoever from among you turns back from his religion (Islam), Allah will bring a people whom He will love and they will love Him,' humble towards the believers, stem towards the disbelievers fighting in the Way of Allah, and never fear of the blame of the blamers. That is the Grace of Allah which He bestows on whom He wills. And Allah is All-Sufficient for His creatures' needs, All-Knower. Verily, your Wali (Protector or Helper) is none other than Allah, His Messenger, and the believers, -those who perform As-Salat (Iqamat-as-Salat), and give Zakah, and they are Raki'un (those who bow down or submit themselves with obedience to Allah in prayer)}.

{O you who believe! Take not as Auliya' (supporters and helpers) your fathers and your brothers if they prefer disbelief to Belief. And whoever of you does so, then he is one of the Zalimun (wrong-doers)}.

{ You (O Muhammad (Peace be upon him)) will not find any people who believe in Allah and the Last Day, making friendship with those who oppose Allah and His Messenger (Muhammad (Peace be upon him)), even though they were their fathers or their sons or their mothers or their kindred (people)}.

{O you who believe! Take not My enemies and your enemies (i.e. disbelievers and polytheists) as friends, showing affection towards them, while they have disbelieved in what has come to you of the truth, and have driven out the Messenger and yourselves (from your homeland) because you believe in Allah your Lord! If you have come forth to strive in My Cause and to seek My Good Pleasure, (then take not these disbelievers and polytheists as your friends). You show friendship to them in secret, while I am All-A ware of what you conceal and what you reveal. And whosoever of you (Muslims) does that, then indeed he has gone (far) astray from the Straight Path}.