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wa 'ivaa albiHaaru sujjirat {6}

[Shakir 81:6] And when the seas are set on fire,
[Pickthal 81:6] And when the seas rise,
[Yusufali 81:6] When the oceans boil over with a swell;

abHuur: few oceans
biHaar: all vast of water collectively.  Its a plural of multituude. Jumlah kasrah.
The water of the oceans will turn into fuel for the fire.