Hi Carol,
Prostration is an ancient sign of deep humility before the Lord. Just
as raising yourself above someone can be a sign that you consider yourself
superior to them, taking the lowest possible position is a sign that one
is below the Lord in the ultimate way.
For references check out this result from BibleGateway.com.
The Cross part is just a Christian tradition that flourished in honor of the Cross
of Jesus Christ.
Hope this helps,
Eric
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