It is narrated from Sayyiduna al-Sa'ib bin Yazid (may Allah be pleased with him) that he said: "In the time of Sayyiduna Umar's (may Allah be pleased with him) caliphate we used to perform (voluntary) prayer on Friday; then, when Sayyiduna Umar (may Allah be pleased with him) came out (for the sermon) and sat on the pulpit, we would stop praying. During that time we would talk among ourselves, and Sayyiduna Umar (may Allah be pleased with him) would also speak with us, to the extent that sometimes a man would ask the companion sitting next to him about the state of their market and about their servants. Then, when the muezzin (having given the call to prayer) fell silent, he (may Allah be pleased with him) would deliver the sermon, and after that we would not speak until he had finished his sermon."
This chain is sahih (authentic) and mawquf (stopping at a Companion).
Hadith Referenceالمطالب العالية بزوائد المسانيد الثمانية / أبواب الجمعة / 712
Hadith Gradingمحدثین:إسناده صحيح، موقوف
Hadith Takhrij«حکم الحدیث المطالب العالیہ محققاً تنسیق د. سعد بن ناصر بن عبد العزيز الشَّثري- مکتبہ شاملہ :قال ابن حجر: هَذَا إِسْنَادٌ صَحِيحٌ مَوْقُوفٌ . » «انفرد به المصنف من هذا الطريق»