Muslim scholars teach that Muslims should be truthful to each other. But to the unbeliever, us infidels, it is a different story.
There are two forms of lying to non-believers that are permitted under certain circumstances, taqiyya and kitman. One of those circumstances is to gain the trust of non-believers in order to draw out their vulnerability and defeat them. And this is what is taught in the Koran, Hadith, and Islamic laws. If you hear that it is no such thing then this is just some taqiyya/kitman being practiced on you.
... “Taqiyya” is the religiously-sanctioned doctrine, with its origins in Shi’a Islam but now practiced by non-Shi’a as well, of deliberate dissimulation about religious matters that may be undertaken to protect Islam, and the Believers. A related term, of broader application, is “kitman,” which is defined as “mental reservation.” An example of “Taqiyya” would be the insistence of a Muslim apologist that “of course” there is freedom of conscience in Islam, and then quoting that Qur’anic verse -- “There shall be no compulsion in religion.” But the impression given will be false, for there has been no mention of the Muslim doctrine of abrogation, or naskh, whereby such an early verse as that about “no compulsion in religion” has been cancelled out by later, far more intolerant and malevolent verses.
“Kitman” is close to “taqiyya,” but rather than outright dissimulation, it consists in telling only a part of the truth, with “mental reservation” justifying the omission of the rest. One example may suffice. When a Muslim maintains that “jihad” really means “a spiritual struggle,” and fails to add that this definition is a recent one in Islam (little more than a century old), he misleads by holding back, and is practicing “kitman.” When he adduces, in support of this doubtful proposition, the hadith in which Muhammad, returning home from one of his many battles, is reported to have said (as known from a chain of transmitters, or isnad), that he had returned from “the Lesser Jihad to the Greater Jihad” and does not add what he also knows to be true, that this is a “weak” hadith, regarded by the most-respected muhaddithin as of doubtful authenticity, he is further practicing “kitman.”
(read the whole article here )
Another article by Daniel Pipes, Islamic Tactics of Taqqiya teaches Muslims to practise Deception , Fraud & Double Standards to spread Islam
Consider This Koranic Quote :
"Let not the believers take those who deny the truth for their allies in preference to the believers--since he who does this cuts himself off from God and everything--unless it be to protect yourselves against them in this way." (CAIR Koran 3:28)
In other words, don't make friends with unbelievers except to "guard yourselves against them". Pretend to be their friends so that you can strengthen yourselves against them.
From the Koran:
Sura (16:106) - Establishes that there are circumstances that can "compel" a Muslim to tell a lie.
Yusuf Ali: "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."
Sura (3:28) - This verse tells Muslims not to take those outside the faith as friends, unless it is to "guard themselves."
Yusuf Ali Sura (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."
Sura (40:28) - A man is introduced as a believer, but one who must "hide his faith" among those who are not believers.
Yusuf Ali: "A believer, a man from among the people of Pharaoh, who had concealed his faith, said: "Will ye slay a man because he says, 'My Lord is Allah'?- when he has indeed come to you with Clear (Signs) from your Lord? and if he be a liar, on him is (the sin of) his lie: but, if he is telling the Truth, then will fall on you something of the (calamity) of which he warns you: Truly Allah guides not one who transgresses and lies!"
Sura (2:225) - It is ok to break your oaths, in fact it is a strategy to use while waging Jihad, open warfare against the infidels. (See Hudna)
Yusuf Ali: "Allah will not call you to account for thoughtlessness in your oaths, but for the intention in your hearts"
Sura (66:2) - This is pretty much the same command as Surah 2:225 above.
Yusuf Ali "Allah has already ordained for you, (O men), the dissolution of your oaths (in some cases): and Allah is your Protector, and He is Full of Knowledge and Wisdom."
From the Hadith:
Bukhari (52:269) - "The Prophet said, 'War is deceit.'"
The context of this is thought to be the murder of Usayr ibn Zarim and his thirty unarmed men by Muhammad's men after he "guaranteed" them safe passage. And keep in mind that they consider infidel lands, not under Sharia laws, as dar al harb (the realm of war).
Bukhari (49:857) - "He who makes peace between the people by inventing good information or saying good things, is not a liar."
Lying is permitted when the end justifies the means.
Bukhari (84:64) - "Whenever I tell you a narration from Allah's Apostle, by Allah, I would rather fall down from the sky than ascribe a false statement to him, but if I tell you something between me and you (not a Hadith) then it was indeed a trick (i.e., I may say things just to cheat my enemy). No doubt I heard Allah's Apostle saying, "During the last days there will appear some young foolish people who will say the best words but their faith will not go beyond their throats (i.e. they will have no faith) and will go out from (leave) their religion as an arrow goes out of the game. So, where-ever you find them, kill them, for who-ever kills them shall have reward on the Day of Resurrection.'"
Speaking from a position of power at the time, Ali confirms that lying is permissible in order to deceive an "enemy."
Bukhari (52:271) -"The Prophet said, "Who is ready to kill Ka`b bin Ashraf (i.e. a Jew)." ammad bin Maslama replied, "Do you like me to kill him?" The Prophet replied in the affirmative. Muhammad bin Maslama said, "Then allow me to say what I like." The Prophet replied, "I do (i.e. allow you)".
Recounts the murder of a poet, Ka'b bin al-Ashraf, at Muhammad's insistence. The men who volunteered for the assassination used dishonesty to gain Ka'b's trust, pretending that they had turned against Muhammad. This drew the victim out of his fortress, whereupon he was brutally slaughtered despite putting up a ferocious struggle for his life.
From Islamic Law:
Reliance of the Traveler (p. 746) - "[it is] obligatory to lie if the goal is obligatory... Whether the purpose is war, settling a disagreement, or gaining the sympathy of a victim legally entitled to retaliate... it is not unlawful to lie when any of these aims can only be attained through lying. But is is religiously precautionary in all cases to employ words that give a misleading impression..."