The statement that conveys the allusion to its best is "God uses the rainbow as a sign of his promise never again to destroy all life on Earth."
How are rainbows biblically allusion?
The line alludes to The Rainbow Covenant, which claims that God will never again allow floodwaters to kill all living creatures, nor will He ever again send a flood to destroy the earth.
God employs the rainbow as a sign of his commitment to never again destroy all life on Earth in this biblical allegory.
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