The symbol of true iman’s  existence in the heart is to bear hostility against disbelievers and to annihilate the things that are peculiar to them and that are the symptoms of disbelief. For Islam and kufr  are opposites, antonyms of each other. Where one of them exists, the other cannot stay and goes away. These two opposite things cannot stay in the same place together. To esteem one of them means to insult, to blame the other.
Allahu ta’ala commands Hadrat Muhammad  , His beloved Prophet (sall-Allahu ‘alaihi wa sallam), who has the attribute khulk-i azim and who is very merciful, to perform amr bil ma’ruf wa nahy an al munkar  , to wage war against disbelievers and to treat them severely. This means to say that it is khulk-i azim to behave severely towards disbelievers. The dignity and honour of Islam is in insulting disbelief and disbelievers. He who glorifies and respects disbelievers insults and dishonors the Muslims. Declaring in the Qur’an, in the one hundred and forty-ninth ayat  of Surat-u Al-i ‘Imran  that those who esteem and follow disbelievers are wrong and will repent, Allahu ta’ala says, “O those who believe my beloved Prophet! If you, believing the words of disbelievers, deviate from the way of my Messenger, and if you, taken in by the lurid and mendacious statements of those who pretend to be Muslims, let your faith and iman be stolen, you will be at a loss in this and the next world. ”
Allahu ta’ala declares that disbelievers are His and His Prophet’s (sall-Allahu ‘alaihi wa sallam) enemies. To love the enemies of Allahu ta’ala and to cooperate with them draws one towards being hostile against Allahu ta’ala and His Prophet. A person thinks of himself as a Muslim, expresses the word tawhid  , and says, “I believe,” and performs salat and every kind of worship, but, on the other hand, cooperates with disbelievers. Yet he does not know that these loathsome actions of his will extirpate his being a Muslim and his iman.
 iman: faith, belief, beliefs of Islam; kalam, i’tiqad.
 kufr: (1) (intention statement or action causing) infidelity, unbelief. (2) being in disbelief. (Intention, statement or action) causing disbelief.
 Hadrat: title of respect used before the names of great people like and Islamic scholars.
 amru bi ‘l-ma’ruf wa ‘n-nahyu ‘ani ‘l-munkar: duty to teach Allah’s commands and to prevent or to disapprove other’s committing His prohibitions.
 ayat: A verse of al-Qur’an al-karim; al-ayat al-karima.
 suura(t): a Qur’anic chapter [a chapter of the Qur’an].
 tawhid: (belief in) the Oneness, Unity of Allahu ta’ala.