The Invocation of Blessings upon the Prophet in the Sermon

Question:
I move on to another question sent by the brother Abu Hashim from Tabuk. He says: Is it permissible, if the khatib mentions the name of the Prophet (peace and blessings be upon him) while he is on the pulpit during the Friday prayer, for me to invoke blessings upon him? And if he says, “Seek forgiveness from your Lord,” during the sitting of rest, should I seek forgiveness and make du'a, or is this considered idle talk?

Answer:
If you hear the name of the Messenger (peace and blessings be upon him) or the Messenger is mentioned in the sermon, you invoke blessings and peace upon him, but secretly; do not raise your voice for it while the imam is delivering the sermon. You invoke blessings upon him in your heart, in your secret. As for when the imam sits between the two sermons, you seek forgiveness and make du'a with whatever is easy for you. Yes.