John Gill Commentary Mark 13:11

"And when they lead you [to judgment], and deliver you up, be not anxious beforehand what ye shall speak: but whatsoever shall be given you in that hour, that speak ye; for it is not ye that speak, but the Holy Spirit." — Mark 13:11 (ASV)

But when they shall lead you, and deliver you up
Lead to councils and courts of judicature, and deliver up to kings and rulers, to the civil magistrate, to be punished by the secular arm:

take no thought before hand ;
be not previously anxious, and carefully solicitous, in a distressing way:

what you shall speak :
to kings and rulers, by way of apology for yourselves, and your own innocence, and in defence of the Gospel:

neither do you premeditate ;
or "meditate", as the generality of copies read: Beza says in one copy it is read, "premeditate": and so in one of Stephens's, as we render it: this clause is omitted in the Vulgate Latin, Arabic, and Ethiopic versions:

but whatsoever shall be given you in that hour ;
whatever shall be immediately suggested to your thoughts, be put into your minds, and laid upon your hearts:

that speak you ;
freely and boldly without the fear of men:

for it is not you that speak, but the Holy Ghost :
not but that they did speak, but they were not the principal authors, either of the matter they spoke, or of the words and language in which they spoke; they were only the instruments of the Holy Ghost; they spoke as they were moved by him: hence their wisdom and eloquence in their self-defence, were amazing, and their arguments strong and unanswerable; (See Gill on Matthew 10:19), (See Gill on Matthew 10:20),