2 Samuel 23:2 records David saying 'The Spirit of the Lord spoke through me'—the basis for Jesus' claim that David spoke 'in the Spirit' here.

Mark 12:36 gives the parallel account, also noting David spoke 'by the Holy Spirit'—reinforcing the same point.

In Acts 1:16, the same claim is made: the Holy Spirit spoke through David, directly paralleling Jesus' statement about David speaking in the Spirit.

In Acts 2:30, David is called a prophet who foresaw and spoke of Christ—confirming that David's words were prophetic and Spirit-inspired.

In Acts 2:31, David's prophetic speech about the resurrection is highlighted, reinforcing that he spoke by the Spirit about the Messiah.

In Hebrews 3:7, a psalm is attributed directly to the Holy Spirit speaking—mirroring Jesus' attribution of Psalm 110 to David speaking in the Spirit.

In 2 Peter 1:21, all prophecy is said to come from God through the Holy Spirit—confirming the divine origin of David's words in Matthew 22:43.

In Luke 20:42, the same event is recorded: Jesus quotes Psalm 110:1, affirming that David called the Messiah 'Lord'—a direct synoptic parallel.