Mark 13:9 describes the trials (councils, synagogues, governors) where believers will be delivered; this verse provides the Spirit's help during those trials.

Exodus 4:10-12 shows God promising to teach Moses what to say — a direct OT parallel to the Spirit giving words in the hour of trial.

Jeremiah 1:6-9 has God putting words in Jeremiah's mouth — another OT parallel of divine speech empowerment for a prophet under commission.

Matthew 10:17 warns of being delivered to courts and flogged — a parallel Synoptic passage on persecution that expands the promise of the Spirit here.

In Matthew 10:20, the same promise that the Spirit speaks through believers during persecution is echoed almost verbatim.

Luke 12:11 gives the same command not to worry about defense, though omitting the Spirit's role explicitly.

Luke 12:12 directly states the Holy Spirit will teach what to say, matching the Spirit's speaking in Mark 13:11.

Luke 21:14 parallels the instruction not to premeditate a defense, part of the same Olivet Discourse teaching.

Luke 21:15 promises Jesus will give mouth and wisdom, a parallel to the Spirit's provision in Mark 13:11.

Acts 4:8-22 narrates Peter filled with the Spirit speaking before rulers, fulfilling the promise in Mark 13:11.

Acts 6:10 recounts Stephen's opponents unable to resist the Spirit's wisdom, a direct example of the promise in action.

In Ephesians 6:20, Paul is an ambassador in chains praying for bold speech — directly paralleling the arrest and Spirit-empowered testimony in Mark 13:11.

In Exodus 4:12, God promises Moses He will teach him what to say — same divine provision for speaking under pressure.

In John 14:26, the Holy Spirit is promised to teach and remind believers — direct parallel to the Spirit speaking through them here.