Sheikh Abdulrahman bin Hassan
(ra) said: Allah Ta’ala labelled the
people of Shirk with Kufr in an
innumerable number of verses
equally one should also
pronouncing takfeer on them and
this is the requisite of “la ilaha ila
Allah”, the statement of sincerity,
therefore it’s meaning cannot be
completed except by pronouncing
takfeer on whoever associated
partners with Allah in his worship
as is (stated) in the authentic
narration “Whoever says “la ilaha
ila Allah” and disbelieves in
whatever is worshipped besides
Allah, his blood and property
becomes forbidden, and his
reckoning is with Allah” so his
saying ‘and disbelieves in whatever
is worshipped besides Allah’: is an
affirmation for negation, so his
blood and wealth doesn’t become
forbidden except by that thus if he
hesitates or doubts his blood and
wealth don’t become forbidden”.
[Ad Durrar as-Saniyyah /606].

Shaykh Hamad Ibn ‘Atīq (may Allāh
have mercy on him) said:
” ﻓﺄﺻﻞ ﺩﻳﻦ ﺟﻤﻴﻊ ﺍﻟﺮﺳﻞ، ﻫﻮ ﺍﻟﻘﻴﺎﻡ
ﺑﺎﻟﺘﻮﺣﻴﺪ، ﻭﻣﺤﺒﺘﻪ ﻭﻣﺤﺒﺔ ﺃﻫﻠﻪ، ﻭﻣﻮﺍﻻﺗﻬﻢ،
ﻭﺇﻧﻜﺎﺭ ﺍﻟﺸﺮﻙ، ﻭﺗﻜﻔﻴﺮ ﺃﻫﻠﻪ، ﻭﺑﻐﻀﻬﻢ ،
ﻭﺇﻇﻬﺎﺭ ﻋﺪﺍﻭﺗﻬﻢ.”
“So, the foundation of the Dīn of all
the Messengers is established by
Tawhīd, and by loving Tawhīd &
it’s people, and by allying with
them; and rejecting the Shirk, and
making Takfīr on it’s people, and
having hatred towards them, and
making prevalent animosity
towards them.”
[Al-Durar Al-Saniyyah 8/418]