Hazrat Alqamah bin Abdullah narrates that we came to Madinah on a Friday. I said to my companions that we should depart, and I came to the mosque and sat near Hazrat Ibn Umar (may Allah be pleased with them). Meanwhile, one of my companions came and started talking to me during the sermon, saying that we did such and such. When he talked too much, I said to him, "Be quiet." When we completed the prayer, I mentioned this matter to Hazrat Ibn Umar (may Allah be pleased with them). He said, "Your Friday (prayer) is not valid, and that companion of yours is a donkey."