Itha jaaka almunafiqoona qaloo nashhadu innaka larasoolu Allahi wallahu yaAAlamu innaka larasooluhu (surah Munafiqun: 1)

Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(63:1) (O Prophet), when the hypocrites come to you, they say: 'We bear witness that you are certainly Allah's Messenger.' Allah certainly knows that you are His Messenger. But Allah also bears witness that the hypocrites are utter liars! *1

Izaa jaaa`akal munaafiqoona qaaloo nashhadu innaka la rasoolul laah; wallaahu ya`lamu innaka la rasooluhoo wallaahu yashhadu innal munaafiqeena lakaaziboon

*1) That is, "Although the thing they. are uttering with the tongue is true by itself, it dces not reflect their belief. Therefore they lie when they say that they bear witness that you are a Messenger of AIIah." Here, one should clearly understand that an evidence or witness is composed of two things: first, the actual thing to which one bears the witness; second, the concerned person's own belief about the thing to which he bears the witness, Now, if the thing by itself is true and the belief of the bearer of witness also correspons to what he says, he will be truthful in every respect. And if the thing in itself is false; but the beater of the witness believes it to be right and true, he will be regarded as truthful in one way, for he is truthful in expressing his belief, and liar in another way, for the thing he is bearing witness to is by itself false. Contrary to this, if the thing by itself is true but the belief of the bearer of the witness is opposed to it, he will be regarded as truthful because he is testifying to the right thing, and a liar because his own belief is contrary to what he is saying with the tongue. For instance, if a Believer states that Islam is a taste religion, he is truthful in every respect, but if a Jew, while he is steadfast in his Judaism, states the same thing, he would be stating the right thing but his evidence would be regarded 8s false, for he is testifying against his faith and belief. And if he calls it a false religion, he would be uttering a false thing but he would be beating a true witness according to his belief.