The Shaykh’s reference to a statement by the Shaykh al-Islam Ibn Taymiyyah (may Allah have mercy on him): “Islam is that we worship Allah alone, not associating anything with Him”

The Shaykh : The Shaykh al-Islam Ibn Taymiyyah (may Allah have mercy on him) has a comprehensive phrase for the foundation of Islam, and this phrase is originally derived from the testimony, which is the first pillar of Islam; where Ibn Taymiyyah (may Allah have mercy on him) said: “Islam is that we worship Allah alone, not associating anything with Him.” This is one part, and the second part is: “That we do not worship Him except by what He has prescribed for us.”
So Islam is gathered in these two phrases: that we worship Him (Blessed and Exalted is He) alone, with no partner for Him, and that we do not worship Him except by what He has prescribed; this is the completion of tawhid (the oneness of Allah), and this is a precise scientific terminology of the Shaykh al-Islam Ibn Taymiyyah; for it is well known that tawhid has three categories: tawhid al-rububiyyah (oneness of lordship), tawhid al-uluhiyyah (oneness of worship), and tawhid al-asma' wa al-sifat (oneness of the names and attributes). So Ibn Taymiyyah came with this concise expression: “That we do not worship except Allah, and that we do not worship Him except by what He has prescribed.”