Surah 3. Aal-Imran

25That is, "If a believer falls into the hands of the enemies of Islam and is afraid of maltreatment and high-handedness, he may conceal his Faith, and live among them as if he were one of them. Or, if they come to know of his Faith, he may make a show of his friendship towards them to save his life. In case of extreme fear, he is permitted even to disown his Faith, if he feels that he is not strong enough to endure their oppression."

26This is the admonition: Let not the fear of the people dominate over you so much as to drive out the fear of Allah from your hearts. The greatest harm the people can do to you is confined to the worldly life only, but Allah has the power to inflict an everlasting torment on you. Therefore, if you are forced in a case of extremity to hide your Faith due to any danger to your life, you may save your own life and property, provided that you do not in any way harm the interests of the Islamic mission and the Islamic community or the life or property of any Muslim. At the same time you must remain on your guard against becoming the instrument in the hands of disbelievers so as to strengthen the evil forces against Islam and render any service to the disbelievers that might enable them to overpower the Muslims. Remember that, if to save your life you do any kind of harm to the religion of Allah or to the community of the faithful or even to the person of a single believer, or if you render any real service to the rebels against Allah, you will never be able to save yourselves on the Day of Reckoning, when you shall have at last to return to Allah