When did the Prophet's teaching of the creed to the Companions become complete, and was the conveyance of the creed completed at a specific time?

The religion was perfected with the revelation of the verse: "This day I have perfected for you your religion and completed My favor upon you and have approved for you Islam as religion" during the Farewell Pilgrimage, 22 years after the Prophet's (peace be upon him) prophethood began. He continued to teach his community matters of creed and law until the end of his life.

Indeed, the Prophet (peace be upon him) warned his community against taking the graves of prophets as places of worship, as in the hadith narrated by Aisha (may Allah be pleased with her): "May the curse of Allah be upon the Jews and Christians; they took the graves of their prophets as places of worship." And before his death, he said: "Expel the Jews of Hejaz and the people of Najran from the Arabian Peninsula, and know that the worst of people are those who took the graves of their prophets as places of worship."

Ibn Taymiyyah mentioned that faith and religion in the early days of Islam were not as complete as they were at the end of prophethood. Faith was incomplete and then became perfected. This does not contradict the excuse of ignorance after the perfection of religion, for the matter depends on the reaching of knowledge and the establishment of the prophetic proof. So, whoever believed in the Prophet (peace be upon him) in the early days of Islam with what was revealed, his faith was complete for what was obligatory upon him, even if it would not be accepted from him if he brought it after the Hijrah.