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Heart and kidneys/reins

Here’s what it means

God examines the deepest thoughts, desires, motives, and emotions of a person.

Why the Bible says it this way

The writer names one closely related thing to stand for the person, action, or larger idea.

A helpful detail: Ancient Hebrew speech associated the heart and kidneys with the inward life. Modern readers can understand the pair as the deepest inner person.

Where it appears