What is the authenticity of the hadiths that were narrated regarding the black flags?

The questioner : We will build on two things. First, I will ask you about the authenticity of the hadiths, or some of the hadiths, that were narrated in the book. Then I will return to ask where we can take topics from their sources. In a hadith, it is narrated that black flags will come from the east, and the horses will wade in blood up to... and it is, of course, related to war, and so on. How authentic is this hadith? It is narrated by al-Bazzar in "Al-Zawa'id."

The Shaykh : I will tell you a general word that will perhaps relieve you from asking about many of the hadiths that mention the black flags. It is my saying that none of the hadiths that mention the black flags are authentic. And whatever is built upon a defective foundation is defective. And you are relieved, and praise be to Allah.