Taqiyya - Shi'ia Doctrine, Opposed by Some Salafiyya

"[Yusufali 16:106] Any one who, after accepting faith in Allah, utters Unbelief, except under compulsion, his heart remaining firm in Faith, but such as open their breast to Unbelief, on them is Wrath from Allah, and theirs will be a dreadful Penalty." [5]
And the following

"[Yusuf Ali 3:28] Let not the believers Take for friends or helpers Unbelievers rather than believers: if any do that, in nothing will there be help from Allah: except by way of precaution, that ye may Guard yourselves from them. But Allah cautions you (To remember) Himself; for the final goal is to Allah."[6]

Ibn Kathir says:“(unless you indeed fear a danger from them) meaning, except those believers who in some areas or times fear for their safety from the disbelievers.

• In this case, such believers are allowed to show friendship to the disbelievers outwardly, but never inwardly
• For instance, Al-Bukhari recorded that Abu Ad-Darda' said, "We smile in the face of some people although our hearts curse them."
• Al-Bukhari said that Al-Hasan said, "The Tuqyah is allowed until the Day of Resurrection.

More @ tafsair

Found here @ Wikipedia