Job 6:3
For now it would be heavier than the sand of the sea: therefore my words are swallowed up.
Cross-references
Job 37:20
Parallel
Job 37:20 uses the same phrase 'swallowed up' for speech to God, directly echoing Job's description of his own words.
Psalm 77:4
Parallel
Psalm 77:4 depicts the psalmist so troubled he cannot speak, mirroring Job's 'words are swallowed up' from overwhelming grief.