What is the validity of this maxim: "We gather the people, then we correct them"?

Question:
He says: Honorable Shaykh, may Allah grant you success, this is a well-known maxim, but the question is whether it is correct or not: "We gather the people, then we correct them."

Answer:
Who said this? Did the Messenger (peace and blessings be upon him) say it? We do not argue except with what is in the Book of Allah and the Sunnah of His Messenger (peace and blessings be upon him). If people gather and you gather them, they will not unite and obey except on the basis of creed. Before that, they testified to the oneness of Allah (tawhid), bearing witness that there is no god but Allah and that Muhammad is the Messenger of Allah.
Then he accepts gathering with us. As for the one who disagrees with us in creed, he can never gather with us. If he gathers with us outwardly, he has not gathered with us in his heart and inner self. Rather, this is hypocrisy (nifaq). This is hypocrisy for purposes that Allah knows best. Therefore, only the correct creed, upon which the Companions of the Messenger of Allah (peace and blessings be upon him) agreed after they were enemies and fighting one another, gathers the people. And remember the favor of Allah upon you when you were enemies and He united your hearts, so you became, by His favor, brothers. And you were on the brink of a pit of the Fire, so He saved you from it. Thus Allah makes clear to you His verses that perhaps you may be guided. This is what gathers the people: the creed of tawhid and faith in Allah (Mighty and Majestic). Yes.