in the lap of the gods
in the lap of the gods also on the knees of the gods {adv. phr.}, {literary}
Beyond human control; not to be decided by anyone.
Frank had worked hard as a candidate, and as election day came he felt that the result was in the lap of the gods.
The armies were evenly matched and the result of the battle seemed to be on the knees of the gods.
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Source: A Dictionary of American Idioms