Psalm 137:9 declares 'happy is the one who seizes your infants and dashes them against the rocks' — an apparent celebration of infanticide against Babylonian children, presented as inspired scripture.

Genre governs interpretation here, and reading the verse as a command or divine endorsement commits a category error — treating poetic lament as if it were legislative or prescriptive speech. Psalm 137 is a communal lament (qinah) composed from within the trauma of the Babylonian exile following Jerusalem's destruction in 587 BC. Imprecatory psalms are a recognized biblical genre of raw, unfiltered prayer-speech directed TO God expressing anguish and a longing for justice, not commands FROM God to be enacted by the worshiper. Walter Brueggemann's influential work on the Psalms of 'disorientation' argues these poems grant permission to bring the full, unedited range of human emotion — including the ugliest desire for vengeance — into speech before God, functioning as a release valve rather than an action plan; Erich Zenger, in A God of Vengeance? Understanding the Psalms of Divine Wrath, argues these psalms perform the crucial theological function of transferring vengeance to God's justice alone ('vengeance is mine, I will repay,' echoed at Rom 12:19) rather than authorizing the psalmist to personally execute it — nowhere does the psalm say the exiled community will do this. The verse addresses 'daughter Babylon' as the imperial power that had itself perpetrated exactly this atrocity against Israelite infants (cf. the same 'dashed against the rocks/wall' language used prophetically of Babylon's own coming judgment, Isa 13:16, and of Israel's prior suffering, Hos 13:16, 2 Kings 8:12), so the psalm voices desperate hope for reciprocal justice against a specific empire's crimes rather than issuing a general policy of infanticide. Its inspiration lies in its honest, canonically preserved witness to authentic exilic anguish, not in its content functioning as moral instruction — a lament, unlike a law code, is not obeyed.

The Bible's inclusion of unfiltered laments alongside law, wisdom, and narrative reflects its broader honesty about the reality of human suffering, giving canonical voice to victims of atrocity rather than requiring only sanitized, pious speech; the New Testament makes the redirection from personal vengeance to God explicit (Rom 12:19, Matt 5:44).