Mark 13:11

9 So be on your guard. You will be delivered over to the councils and beaten in the synagogues. On My account you will stand before governors and kings as witnesses to them.

10 And the gospel must first be proclaimed to all the nations.

But when they arrest you and hand you over, do not worry beforehand what to say. Instead, speak whatever you are given at that time, for it will not be you speaking, but the Holy Spirit.

12 Brother will betray brother to death, and a father his child. Children will rise against their parents and have them put to death.

13 You will be hated by everyone because of My name, but the one who perseveres to the end will be saved.

Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB
But when they arrest you and hand you over, do not worry beforehand what to say. Instead, speak whatever you are given at that time, for it will not be you speaking, but the Holy Spirit.
KJV
But when they shall lead you, and deliver you up, take no thought beforehand what ye shall speak, neither do ye premeditate: but whatsoever shall be given you in that hour, that speak ye: for it is not ye that speak, but the Holy Ghost.
WEB
When they lead you away and deliver you up, don’t be anxious beforehand or premeditate what you will say, but say whatever will be given you in that hour. For it is not you who speak, but the Holy Spirit.
ASV
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.
DARBY
But when they shall lead you away to deliver you up, be not careful beforehand as to what ye shall say, [nor prepare your discourse]: but whatsoever shall be given you in that hour, that speak; for *ye* are not the speakers, but the Holy Spirit.
BLB
But when they might lead you⁺ away, delivering [you] up, do not be anxious beforehand what you⁺ shall speak; but whatever might be given to you⁺ in that hour, speak that. For you⁺ are not the ones speaking, but the Holy Spirit.
ÅB
Og når de fører dere fram og overgir dere, da vær ikke forut bekymret for hva dere skal tale! men det som gis dere i samme stund, det skal dere tale; for det er ikke dere som taler, men den Hellige Ånd.
OTB
Når de arresterer dere og overgir dere, ikke bekymre dere på forhånd for hva dere skal si; si det som blir gitt dere i det øyeblikket, for det er ikke dere som taler, men Den Hellige Ånd.
B1930
Og når de fører eder frem og overgir eder, da vær ikke forut bekymret for hvad I skal tale! men det som gis eder i samme stund, det skal I tale; for det er ikke I som taler, men den Hellige Ånd.

Study notes (Tyndale)

Original text and word study

Cross references