Muwatta Malik 230
موطأ مالك#230SahihYahya related to me from Malik from Abu'z Zinad from al-Araj from Abu Hurayra that the Messenger of Allah, may Allah bless him and grant him peace, said, "Even saying to your companion 'Listen' while the imam is giving the khutba on the day of jumua, is to speak foolishly
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Salim al-HilaliSahih
In-book reference: 5:6