Job 12:9-25 is the preceding speech about God's sovereignty that Job directly refers to with 'all this'.

In Job 15:17, Eliphaz declares 'what I have seen I will declare' — the same claim of personal observation that Job makes in 13:1.

Job 42:3-6 contrasts sharply: Job admits he spoke without understanding, humbling his earlier claim of full comprehension.

In Job 8:8-10, Bildad urges inquiry from past generations. Job's personal 'seen and heard' contrasts with relying on inherited tradition.

In Psalm 78:3, the psalmist says 'we have heard and known' from fathers — nearly identical language to Job's 'ear has heard and understood'.

In 1 John 1:3, John says 'that which we have seen and heard we proclaim' — the same phrase Jesus' disciple uses for eyewitness testimony.