Ibn Shihab narrates from Tha'labah bin Abi Malik (may Allah be pleased with him) that in the time of Sayyiduna Umar (may Allah be pleased with him), on Friday they would keep praying until Sayyiduna Umar (may Allah be pleased with him) came out. When he came and sat on the pulpit and the caller gave the call to prayer, they would all sit and talk, until, when the caller fell silent and Sayyiduna Umar (may Allah be pleased with him) stood up, they would all fall silent and not a single one of them would speak.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجمعة / 5684