The daʿwah (call) to single Allāh out with one’s worship, love, and hate for Allāh’s sake is based upon this principle, those who do not embrace and live by this are declared to be disbelievers.
Warning against shirk, associating partners in any type of worship with Allāh and being serious in this warning, and having hatred for polytheism. Whoever would uphold these two principles, in truth, is a Muslim, a worshipper of Allāh, not worshipping other than him, having hope in Allāh alone. These are the two principles that all the Prophets and Messengers confirmed to.
Shaykh ʿʿUbayd al-Jābirī...