In the copy available to us, there is no hadith or its chain of narration present here; only the word "haddathana" is written. And in the footnote, it is explained as follows: In some copies of Musnad Ahmad, this error occurred that the scribes took the chain of narration of hadith number (7489) and placed upon it the text of hadith number (7491).
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 7824