Is it true that 'Umar (may Allah be pleased with him) used to seek refuge in Allah from four things after the prayer, before the taslim, and would say it aloud to inform the people?

The questioner : I heard that 'Umar (may Allah be pleased with him) used to seek refuge in Allah from four things after the prayer, saying it aloud before the taslim to inform the people. The scholar cited this as evidence that he was informing the people, so I asked the shaykh about the authenticity of this narration. He said, "Where did you read this?" I said, "In one of the back pages of a book." He said, "It is probably a fabrication."

The Shaykh : I told you that what I heard was a fabrication.

The questioner : What I heard? Yes, I will review this hadith. I know the source, with your news, by the permission of Allah the Exalted.
The student : O Shaykh, I saw the imam.

The Shaykh : And I will tell you the origin of the misconception, so wait.

The questioner : If Allah wills.