Commentaries:
Barnes' Notes
The Lord shall preserve thee from all evil - This is an advance of the thought. The psalmist had in the previous verses specified some particular evils from which he says God would keep those who put their trust in him. He now makes the remark general, and says that God would not only preserve from these particular evils, but would keep those who trusted in him from all evil: he would be their Protector in all the perils of life.
He shall preserve thy soul - Thy life. See Psalms 41:2; Psalms 97:10.
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