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"If I make my bed in hell" from Psalm 139:8

"If I make my bed in hell" from Psalm 139:8

Psalm 139:8 (KJV),

8 If I ascend up into heaven, thou art there: if I make my bed in hell, behold, thou art there.

I am interested to know what the Psalmist meant by making his "bed in hell". It sounds like an idiom to me. Is i…