Why did the Prophet (peace and blessings be upon him) forbid the preacher who combined Allah and His Messenger in a single pronoun and said, "And whoever disobeys them both has gone astray"?

The questioner : Professor, the preacher who delivered a sermon in the presence of the Prophet (peace and blessings be upon him) said: This is the well-known hadith.

The Shaykh: Yes.

The questioner : The Prophet (peace and blessings be upon him) forbade this phrase , meaning, what is the reasoning for that?

The Shaykh : As for the reasoning, "What Allah wills and what you will, O Messenger of Allah." I do not think the matter is hidden from you.

The questioner: Yes.

The Shaykh : Fine, this is like that.

The questioner : Imam al-Nawawi in "Sharh Muslim" says: The Messenger (peace and blessings be upon him) says in the hadith: He says he combined Allah, or the word Allah, with the Messenger (peace and blessings be upon him) using a single pronoun. Yes, he says, meaning the reasoning given by Imam al-Nawawi is simply that the place of the sermon is for elaboration and clarification.

The Shaykh : What is the problem here? What is the issue?

The questioner : The issue is whether this is the reasoning.

The Shaykh : I am now responding to what you quoted from al-Nawawi, and I am not saying that I am responding to al-Nawawi. Pay attention, Doctor; do not quote me as responding to al-Nawawi. I am responding to what was quoted from al-Nawawi. And upon you be peace, the mercy of Allah, and His blessings. In terms of clarification and elaboration, what is the difference between the two expressions?

The questioner : The difference between the first expression.

The Shaykh : The expression the Messenger (peace and blessings be upon him) forbade and the expression the Messenger (peace and blessings be upon him) used, which al-Nawawi cites as evidence. What is the difference?