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Al Wala Wal Baraa is a core Koranic belief, with NUMEROUS verses to show its importance. It means simply that Muslims MUST hate all non-Muslims, never take them as friends (even if they are their fathers, brothers, relatives) . Any Muslim who takes non-Muslims as friends is no longer a Muslim ('he is one of them'), and will go straight to hell.
Koran 3:28 (KEY VERSE): Let not the believers take disbelievers for their friends in preference to believers. Whoso doeth that hath no connection with Allah unless (it be) that ye but guard yourselves against them, taking (as it were) security. Allah biddeth you beware (only) of Himself. Unto Allah is the journeying.
"unless that ye guard against them, taking security" is the key verse underlying TAQQIYYA. i.e. Allah-approved Islamic lying, if Muslims are not in a strong position.
Koran 58:22 : You (O Muhammad) will not find any people who believe in Allah and the Last Day, making friendship with those who oppose Allah and His Messenger (Muhammad), even though they were their fathers, or their sons, or their brothers, or their kindred
Koran 9:23: O ye who believe! Choose not your fathers nor your brethren for friends if they take pleasure in disbelief rather than faith. Whoso of you taketh them for friends, such are wrong-doers.
Koran 9:123: O you who believe! Fight those of the disbelievers who are close to you, and let them find harshness in you,
Koran 9:113: It is not (proper) for the Prophet and those who have believed (Muslims) to ask forgiveness for the disbelievers, even if they were relatives
Koran 5:51: O ye who believe! Take not the Jews and the Christians for friends. They are friends one to another. He among you who taketh them for friends is (one) of them. Lo! Allah guideth not wrongdoing folk.
Koran 4:144: O ye who believe! Choose not disbelievers for (your) friends in place of believers. Would ye give Allah a clear warrant against you? (i.e.give Allah a reason to send you to hellfire)