Sabet Ibn Ahmad Abul Qasem (rahmatullahi alaihe) narrates that he was once observing a muezzin calling out athan for the Fajr prayer.
As the muezzin said “Assalatu khairum minan nawm”, a khadem (usually a volunteer at a mosque) slapped the face of the muezzin. At this, the muezzin started to cry and stated: “Oh Rasool Allah (sallallahu alaihe wa sallam)! I am being treated this way in your presence.” Immediately after this, the khadem’s whole body became paralyzed. He was lifted and transported to his residence by individuals present at the mosque.
The khadem passed away three days after the incident.