Walking represents living, and usually means living according to the true things taught to us by the Lord -- to "walk in His ways." When the Lord is pictured walking, it means life itself.
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The whole valley of the dead bodies and of the ashes, and all the fields to the brook Kidron, to the corner of the horsegate toward the east, shall be holy to Yahweh; it shall not be plucked up, nor thrown down any more forever.