Hakikat Kitabevi Publications No: 10 answer to an enemy of islam

‘A Muslim who does the following three deeds has
perfect îmân: serving one’s household, sitting together with the
poor [not with beggars!] and eating together with one’s servants.’
In the Qur’ân al-kerîm, these three things are declared to be the
qualities of Believers. We should learn the manners of the Salaf
as-sâlihîn and try to be like them. We should not speak ill of
anybody in his absence. We should prevent a backbiter. [It is
ghîba to talk behind a person’s back in a manner that would hurt
him when he hears it and even if what you say is true. If it is a lie,
it is 
iftirâ (slander). Both are grave sins.] We should form it a
habit to perform al-amru bi ’l-ma’rûf wa ’n-mahyu ’ani ’l-
munkar.
[1]
Muhammad ibn Alyan’a was asked how to understand
if Allâhu ta’âlâ likes you. He said, ‘It is understood when tâ’a
comes sweet and committing sins comes bitter to you.’ We should
not be stingy with the fear of becoming poor. The Devil deceives
man by saying that he may become poor and by tempting him to
fornication. A hadîth sherîf declares, 
‘A person who has a
crowded household but little food and who performs his salât well
and who does not backbite Muslims will be with me on the Day
of Resurrection.’ ”
[2]
A Muslim who possesses the qualities of goodness written
above is called a man of religious authority. We should realize that
a person who does not own such qualities, and who even dislikes,
belittles those who posses them, is not a man of religious authority,
but an enemy of Islam, and we should not believe his words or
writings.
46– What does 
bid’a mean? In the 54th, 165th, 186th, 255th,
260th and 313th letters of the first volume of the book 
Maktûbât,
al-Imâm ar-Rabbânî Ahmad al-Fârûqî ‘rahmatullâhi ’alaih’
eleborated on what bid’a is and on the harms of committing bid’as.
– 103 –
[1] Duty to teach others what Allâhu ta’âlâ’s commands are and to
prevent, to disapprove somebody’s committing His prohibitions.
[2] Muhammad Ma’thûm al-Fârûqî as-Sirhindî, 
Maktûbât, vol. II, 110th
letter.

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We have translated all of the 313 letters in its first volume from
Persian into Turkish, and partly into English, and published them
in Istanbul in 1387 (1968). Also, there is detailed information on
bid’as in the first part of the Arabic book