Imam Ahmad ibn Hanbal (rahimahullah):

I did not write a single hadeeth except verily I acted on it, to the extent that it came to me that the Prophet (sallallaahu alaihi wa sallam) was cupped and gave Abaa Tayba a deenar, so I was cupped and gave the cupper a deenar.

Siyaar A’laam An-Nubalaa Vol 11 Page 296