Hasan (may Allah have mercy on him) narrates: Sayyiduna Mu'adh bin Jabal (may Allah be pleased with him) fell unconscious, and his sister began to say: "O Jabal!" or some other words like it. When he regained consciousness he said: "You have kept on hurting me all day today." She said: "It would be very hard on me to hurt you." He said: "A severely rebuking angel stayed with me constantly; every time you said 'O so-and-so!' he would say: 'Are you really like that?' And I would say: 'No.'"
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17186