In The Name of Allaah, The Most Merciful, The Bestower of Mercy
Shaikh Muqbil Bin Haadi (rahimahullaah) stated:
Jarh Al’Aqraan- criticism carried out by contemporaries against one another- is more credible than the (criticism carried out by others against one and other). That is because they (i.e. contemporaries) are more knowledgeable (about the affair of) their companions. It (i.e. the Jarh Al-Aqraan) is accepted unless if it is known that there is rivalry and enmity between them (i.e. between two contemporaries) due to a worldly affair or (competition for) status; or (due to) a mistake in understanding and he (i.e. a contemporary) wishes to compel the other to his mistaken understanding (i.e. then in such a case the criticism is investigated). 
The Shaikh (rahimahullaah) also stated regarding the affair of investigating a weak criticism: If it is known that there was a worldly rivalry between two contemporaries- [between] the criticiser and the one criticized, and this can happen, such as what took place between Abu Nu’aim and Ibn Mandah; and (what occurred between) Ibn Hibbaan and some of his contemporaries- then its reason is examined.
If the reason was due to rivalry or (due to a) worldly affair, then this (is something about which one should) hold back; or if the criticiser does not know (the reason) behind the criticism- for it is required that he knows the reasons behind the criticism; or if he has (some) aim similar to that of these debased ones of the present day – such as Abu Riyyah and those who followed his path such as Ahmad Ameen; similarly is Al-Kawtharee, who authenticates (narrations) and passes judgements (against narrations as being) weak based on desires; also Muhammad Rasheed authenticates or (passes judgements on narrations as being) weak based on desires; also this is (the case with) Jamaalud’deen Al’ Afghaanee and Muhammad Abduh Al’Misriy- all these people and those who followed their path, their speech is neither accepted nor is it treated with honour..
Question to Al-Allaamah Saalih Al-Fawzaan (may Allaah preserve him)
At present whenever a scholar refutes another (person) who erred, they say: This is speech of contemporaries, it will come to pass and will not be transmitted. What is your view regarding this principle and is it (applied) absolutely?
It is obligatory to clarify the truth and refute the error. We do not flatter anyone; we clarify the error and direct to the truth and our (concern) is not the importance of this one or that one. It is not permissible to keep quiet; because if we were to abandon (speaking) about this error, and that second error and that third error, the errors will become numerous and the people will think that it is the truth due to the silence of the scholars about it and will consider it as a proof. Therefore, clarification must be carried out especially when the one who erred is one followed or has leadership. And it is not to be said that errors are narrated and will come to pass; rather it should be said that it is narrated and refuted; because this is from sincerity to Allaah, His Book and His Messenger, and it is advice to the leaders of the Muslims.  [End of quote]
A short reminder to Greenlane’s Admin
This is a precise knowledge based clarification in the affair, so do not hide reality! May Allaah preserve our scholars and include us amongst those who truly follow that which they clarify based on the Book, the Sunnah and the understanding of the Salaf. That speaker of yours did not give justice to this subject matter as opposed to the manner in which it has been clarified by Shaikh Muqbil and Shaikh Fawzaan. He mentioned Jarh Al-Aqraan in one of his lectures in America and left the listeners under the impression that the speech of contemporaries against one another is not to be accepted, and this erroneous view is utilised by some of your staunch supporters in the UK as a lame excuse to reject the valid criticisms against your Hizbiyyah.
Indeed, there is nothing personal between you and the Salafiyyoon, rather the refutations directed at you by the students at SalafiPublications is solely due to the fact that you are a people of Hizbiyyah – allies of Al-Maghrib Institute, Ihyaa At-Turaath and others. Reminder see link:
We ask Allaah for Ikhlaas, Thabaat and Husnul Khaatimah. Aameen.
 [المقترح في أجوبة بعض أسئلة المصطلح ] page: 103
 [إجابة السائل على أهمِّ المائل – page:401. Publishers: (مكتبة صنعاء الأثرية ) 1st edition 2004]
 Al-Ijaabaatul Muhimmah Fil Mashaakil Al-Mulimmah. Page:236