ٱلْيَوْمَ أَكْمَلْتُ لَكُمْ دِينَكُمْ وَأَتْمَمْتُ عَلَيْكُمْ نِعْمَتِى وَرَضِيتُ لَكُمُ ٱلْإِسْلَـٰمَ دِينًۭا

“Today I have perfected your faith for you, completed My favor upon you, and chosen Islam as your way.” (Q, 5:3)

This verse was revealed after the Prophet introduced Ali (peace be upon him) as his successor when he returned from Ghadir Kham, and this was the last obligation that God revealed and no other obligation was revealed after that.

Then, in his explanation, he says: The duties of guardianship were completed because the Prophet, may God bless him and grant him peace, transferred all that God had deposited with him in terms of knowledge to Ali, peace be upon him, and then through him to his descendants, one after the other. So when he put them in their place, he enabled people to refer to them in halal and haram, and he continued this with the rise of one after the other, and in this way he perfected the religion and completed the blessing.