Love of Allāh is the Basis of Tawhīd in Terms of Actions If the basis of practical īmān is the love of Allāh and His Messenger (صلى اللّٰه عليه و سلم), and the love of Allāh is the basis of practical tawhīd and the basis of deification, which is to worship Allāh alone with no partners, then worship is the most complete form of love and the most complete form of submission, and this is islām. The worst sin is to associate partners with Allāh in worship. He, the Glorified, does not forgive shirk