What is the authenticity of the hadith about the Romans and the Yellow One gathering against a man whose name is Sad?

The questioner : May Allah bless you, my brother. I am Ahmad Mur'ib, and by Allah, this hadith is currently widespread among people, and we need to ask you about it if possible.

The Shaykh : Where are you speaking from?

The questioner : From Jabal al-Nadif.

The Shaykh : What is the hadith?

The questioner : My dear master, the hadith is as the Messenger of Allah (peace and blessings be upon him) said:

The Shaykh : But it is clear from its title that it is written.

The questioner : Correct, it is written from its title, meaning it is fabricated?

The Shaykh : This is not one of the hadiths of the End Times.

The questioner : My master, may Allah bless you.

The Shaykh : And may He bless you.

The questioner : May Allah bless you, thank you.

The Shaykh : Welcome.

The questioner : Welcome, elders.

The Shaykh : That is not how you say it; you say "As-salamu alaykum."

The questioner : Peace be upon you.