With the Name of Allah the Merciful, the Bestower of Mercy

The praise and thanks is to Allah the Lord of the worlds, and may Allah mention our Prophet Muhammad amongst the angels and sanctify him and honor him as well as his family, Sahaabah [8] and all those who follow him in righteousness until the Day Of Resurrection. To proceed:

Remarks On The Danger Of The Article Of Al-Khateeb
I have seen in the magazine entitled Al-Muslimoon an article by Abdul-Kareem Al-Khateeb in which he denies what is reported by the Messenger of Allah (sallallahu 'alaihi wa sallam) regarding the appearance of the Mahdi 9 at the end of time and what is reported regarding the coming of the Dajjaal [10] and the descending of ‘Eesa the son of Mary,[11] may the salaah and salaam of Allah be upon both of them. This boldness is both tremendous and extremely dangerous because the denial of confirmed hadeeth [12] of the Prophet (sallallahu 'alaihi wa sallam) accompanied by both it's refutation and rejection points to a disdain and scorn of the words of the Messenger of Allah (sallallahu 'alaihi wa sallam) and makes necessary a renouncement of him (sallallahu 'alaihi wa sallam) and adherence to other than the path of a believer.

A Warning To Those Who Deny Authentic Hadeeth, Reject Them, And Repudiate Them
Allah Most High has stated,
Whosoever renounces the Messenger after the guidance has been made clear to him and proceeds to follow other than the way of the believers we shall turn away from him for what he has undertaken and burn him in hell. What a terrible end! [13] And the Most High says, Rather they deny what they cannot understand and when the explanation of it comes to them. Such is the denial of those who preceded them and look at the outcome of the deniers of the truth. [14] Nor is the denial of the confirmed sayings of the Prophet (sallallahu 'alaihi wa sallam) an insignificant matter because Allah Most High says, ...What the Messenger has forbidden you from, desist from it and fear Allah. Verily Allah is intense in punishment. [15] It is related in Saheeh Muslim from Abu Hurairah (radiallahu anhu) that the Messenger of Allah (sallallahu 'alaihi wa sallam) said, “I have been ordered to fight the people until they bear witness that there is no deity deserving of worship except Allah and they believe in me and that which I have brought. If they do this then their blood and wealth is inviolable to me except with just cause and their account rests with Allah.”

Obligation Of Belief In All That The Prophet (Sallallahu 'Alaihi Wa Sallam) Has Informed Us Of The Matters Of The Unseen
This (i.e. the above hadeeth) is a proof that it is incumbent to believe in all that the Messenger of Allah (sallallahu 'alaihi wa sallam) has informed us whether about past events or what will occur in the future. This also shows that the inviolability of one's life and wealth is for those who believe in the
Messenger (sallallahu 'alaihi wa sallam), and all that he brought, and whosoever disbelieves does not share this immunity. This becomes that much more intensified against anyone who rejects confirmed ahadeeth of the Prophet (sallallahu 'alaihi wa sallam) and contradicts or opposes them based upon their own or someone else's opinion.

Stubborness In Rejecting Authentic Hadeeth
Imaam Ahmed (may Allah Most High have mercy upon him) has said “Whosoever rejects the hadeeth of the Messenger of Allah (sallallahu 'alaihi wa sallam) is on the brink of destruction”
Ishaaq ibn Raahuwayh said: “Whosoever has received information from the Messenger of Allah (sallallahu 'alaihi wa sallam) confirms its authenticity and then rejects it without knowledge (i.e evidence to the contrary) is a disbeliever (kaafir).”

Abu Muhammad Al-Barbahaari stated in his Sharhus-Sunnah “If you hear a man who discredits the traditions and does not accept them or he denies something of the information from the Messenger of Allah (sallallahu 'alaihi wa sallam), then doubt his Islam for he is a man of the vilest thought and speech. He is in fact discrediting the Messenger of Allah (sallallahu 'alaihi wa sallam) and his Sahaabah.” He also stated “Any one of the people of the qiblah [16] is not expelled from the fold of Islam until he has rejected a verse of the Book of Allah the Mighty and Sublime or has rejected something from the traditions of the Messenger of Allah (sallallahu 'alaihi wa sallam), or prays to other than Allah or slaughters for other than Allah. If so, it is your duty to expel him from the fold of Islam.”

He further stated “Whosoever rejects a single verse from Allah's Book has rejected the Book in its entirety, and whosoever rejects ahadeeth of the Messenger of Allah (sallallahu 'alaihi wa sallam) has certainly rejected the entirety of the traditions and is by that a disbeliever in Allah the Most Great.”

Ibraaheem ibn Ahmed ibn Shaaqilaa has said “Whoever opposes news [of the Prophet (sallallahu 'alaihi wa sallam) and insolently dares to reject what has been transmitted by a trustworthy narrator (adl) who has transmitted directly from someone who is also adl - with no break in the chain of narration and no criticism of transmitters (narrators) - has forced his way into the rejection of Islam”.

Ibn Hazm stated in Kitaabul Ahkaam “When there comes the text (of a hadeeth) and no two Muslims differ on its correctness and authenticity as having come from the Messenger of Allah (sallallahu 'alaihi wa sallam) and being what he has in fact said, then it is obligatory to follow it. It (i.e. the sunnah) is the explanation of what Allah intends in the Qur'aan and clarification of what has been mentioned without details.”

Notes:

[8] Companions. Those Muslims at the time of the Prophet (sallallahu alaihiwa sallam) who saw him and died as believers.

[9] The awaited leader from the family of the Prophet (sallallahu 'alaihi wa sallam).

[10] Lit. Great Deceiver, the Anti-Christ

[11] Jesus ('alaihi salaam)

[12] Pl. Ahadeeth: Speech, or report of the Prophet (sallallahu 'alaihi wa sallam) in which his prohibitions, orders, tacit approvals, and
personal characteristics are contained.

[13] Q. An-Nisaa' 4:115

[14] Q. Yoonus 10:39

[15] Q. Al-Hashr 59:7

[16] Direction in which the Muslims pray toward the Ka'ba in Mecca.