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The
very foundation of good is Tawhid (belief in the Oneness of Allah/ monotheism)
and being sincere to Him; whereas, the very foundation of evil is Shirk
(associating others with Allah in His Divinity or worship) and worshipping
others apart from Allah. All the messengers of Allah were sent to call people
to believe in the Oneness of Allah (Exalted be He), which is the highest point
of good, and forbid them to associate others with Allah, which is the worst
level of evil.
Fatwas
of Ibn Baz, (Part No. 27; Page No. 382)
https://www.alifta.gov.sa/En/IftaContents/IbnBaz/Pages/FatawaDetails.aspxView=Page&PageID=5269&CultStr=en&PageNo=1&NodeID=1&BookID=14
