His teachings changed over decades. Early lectures (1970s–1980s) were more traditional, while later ones became increasingly focused on his personal leadership and the movement's specific doctrines.

To understand the controversy, read the official rulings from Malaysia's Department of Islamic Development (JAKIM) regarding Al-Arqam. This provides the legal and theological counter-arguments to his specific claims.

Early lectures often focused on Tazkiyatun Nafs (purification of the soul) and traditional Islamic education.

Abuya Ashaari Muhammad (1937–2010) was the founder of the Al-Arqam movement in Malaysia, which was banned in 1994 due to teachings that were declared deviant by Islamic authorities. Because his lectures ( ceramah ) often blend Islamic theology with specific ideological goals, a "guide" to his teachings must be approached with an understanding of both their historical impact and their controversial status.

Many of his recordings are preserved as historical artifacts. Platforms like YouTube host multi-part lecture series, such as "Hidup Mengikut Pandangan Islam" (Life from an Islamic Perspective).

If you are researching his teachings for academic or historical reasons, follow these steps: