Not graded
Musnad Ahmad 8682
وَبِهَذَا الْإِسْنَادِ عَنْ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِذَا تَكَلَّمْتَ يَوْمَ الْجُمُعَةِ فَقَدْ لَغَوْتَ وَأَلْغَيْتَ
This hadith has no English translation yet: the Arabic text, the reference and the grade are shown here.
Reported by Ahmad (No. 8682).