In John 14:25, Jesus notes he speaks while still with them — this sets up the foretelling purpose in the main verse for when he is gone.

John 13:19 uses the identical 'I tell you before it happens so that you may believe' formula, showing this is a repeated theme in Jesus' farewell discourse.

In John 19:35, the same purpose clause 'so that you may believe' appears, linking eyewitness testimony to the foretelling here.

Matthew 24:25 has Jesus directly saying 'I have told you ahead of time' — a near-identical statement to John 14:29's purpose.

Mark 13:23 has Jesus saying 'I have told you everything ahead of time' — the same motif of forewarning for belief.

Ezekiel 24:24 shows the prophet as a sign so they will know God — parallel to Jesus telling events beforehand so they may believe.