Nullifiers of the two testimonies are the nullifiers of Islam because it is that one pronounces in order to enter Islam. Uttering is affirming their intent, and being steadfast in establishing their prerequisites like fulfilling the rituals of Islam.
If one forsakes this steadfastness then he has invalidated the pledge he took when he uttered the two testimonies.
The nullifiers of Islam are many and the scholars have collected them in books of Fiqh under the title, ‘The Chapter of Riddah (Apostasy).’ However, the most important of them are ten, which have been mentioned by Shaikhul-Islam Muhammad Ibn Abdul Wahhab (rahimahullah) (they are the following):
- Shirk in the worship of Allah. Allah says, “Verily! Allah forgives
not (the sin of) setting up partners in worship with Him, but
He forgives whom he pleases – sins other than that…”
[Soorah an-Nisa (4): 116] and, “Verily, whosoever sets up
partners in worship with Allah, then Allah has forbidden
Paradise for him, and the Fire will be his abode. And for the
Zalimoon (polytheists and wrongdoers) there are no
helpers.” [Soorah al-Maida (5): 72] and it includes sacrificing
for other than Allah, like tombs and jinn.
- Setting up intercessors between oneself and Allah, invoking
them, asking them for intercession and relying upon them.
One who does this is considered by consensus a disbeliever.
- He who does not declare the Mushrikeen (those who
associate partners in worship with Allah) to be disbelievers,
or doubts their disbelief, or approves their Madhhab (faith,
creed) has disbelieved (in Allah).
- Believing that the guidance of someone other than the
Prophet is more complete than his guidance, or that the
ruling of other than him is better, like those who prefer the
ruling of the tawagheet (pl. of Taghoot meaning things
worshiped other than Allah) over the ruling of Allah’s
Messenger and they prefer manmade laws to Islam
- He, who hates something from that which the Messenger
camewith, has disbelieved, even if he was acting upon it.
- He, who mocks at something from the Religion of the
Messenger, its rewards or punishments, has disbelieved. The
proof of this is the Saying of Allah, “Say, ‘Was it at Allah, and
His Ayat and His Messenger that you were mocking? Make
no excuse, you have disbelieved after you had believed.”
[Soorah Tawbah (9): 65-66]
- Magic. From the types of magic is that which causes unity and
disunity among people (like causing separation of the
husband from his wife or causing him to love her). He, who
does this or is pleased with it, has disbelieved. The proof is
the Saying of Allah, “…but neither of these two (angels) taught
anyone (such things) until they had said, ‘We are only for
trial, so disbelieve not (by learning this magic from us).’”
[Soorah al-Baqarah (2): 102]
- Aiding and cooperating with the Mushrikeen (disbelievers)
against the Muslims. The proof is the Saying of Allah, “If any
amongst you takes them as Awliya, then surely he is one of
them. Verily, Allah guides not those people who are the
Dhalimoon (polytheist and wrongdoers and unjust).” [Soorah
al-Maidah (5): 51]
- He, who believes that some people can be excused from the
Sharee’ah of Muhammad , just like Khidr was not liable
to the Sharee’ah of Moosa , is a disbeliever. I (i.e., Saleh al-Fawzan) say,
‘this is just like what the extremist Sufis believe that they
reach a stage (through their piety), where they
are not in need of following the Messenger.
- Turning away from the religion of Allah, neither learning it,
nor acting upon it. The proof is the Saying of Allah, ‘But those
who disbelieve, turn away from that whereof they are
warned.” [Soorah al-Ahqaf (46): 3] “And who does more
wrong than he, who is reminded of the Ayaat (proofs,
evidences, verses, lessons, signs, revelations, etc.) of his Lord,
then he turns aside therefrom? Verily, We shall exact
retribution from the Mujrimoon (criminals, disbelievers,
polytheist, sinners, etc.).” [Soorah as-Sajdah (32): 22]
Appendix (from “What You Must Believe About Your Creator” by Shaikh ibn al-Uthaimeen.) adapted from the book, ‘Aqeedah at-Tawheed’ by Saleh ibn Fawzan ibn Abdullah al-Fawzan
Read: Pillars of the two testimonies on pg 59.