Musannaf Ibn Abi Shaybah 5409 — Speaking when the imam has ascended

Alqamah bin Abdullah said: We came to Madinah on a Friday. I told my companions to set off, and I came to the mosque and sat down near Sayyiduna Ibn Umar (may Allah be pleased with them both). Then a man from among my companions came and began talking to me during the sermon, saying that we had done such and such. When he talked too much, I said to him, "Be quiet." When we had finished the prayer, I mentioned this to Sayyiduna Ibn Umar (may Allah be pleased with them both). He said: "Your Jumu'ah did not count, and as for that companion of yours, he is a donkey."