If you are having difficulty understanding some of what has been said by the speaker, restrain yourself until he finishes, and thereafter ask for clarification gently, politely and with a proper introduction. Do not interrupt a person’s talk. This is contrary to the proper manner of listening and stirs up contempt in the heart. However, this is not the case if it is a gathering of studying and learning. In such a case, asking questions and initiating a discussion is desirable if conducted respectfully and tactfully and only after the teacher finishes.
Khalifah Al-Ma’mún [Rahimahullah] said, “Discussion entrenches knowledge more than mere acceptance.”
Imam Haitham Ibn ‘Adi [Rahimahullah], a known scholar and historian as well as, one of the companions of the four khalifahs, Abu Jafar Al-Mansúr, Al-Mahdí, Al-Hádí, and Ar-Rashid [Rahimahumullah] said, “The men of wisdom say:
“It is disrespectful to overwhelm people as they speak and to interrupt them before they end their speech.”