مسند أحمد

It was narrated that Qatadah said: I heard Abu `Uthman an-Nahdi say: the letter of ‘Umar came to us when we were in Adhrabeejan with `Utbah bin Farqad, or in Syria, (saying). The Messenger of Allah (ﷺ) forbade silk except so much - two fingers. Abu `Uthman said: We had no doubt that he meant silk borders.

It was narrated that Qatadah said: I heard Abu `Uthman an-Nahdi say: The letter of ‘Umar came to us...