Proverbs 20:27 New English Translation

²⁷The human spirit^[a] is like^[b] the lamp^[c] of the Lord,
searching all his innermost parts.^[d]

Proverbs 20:27 sn The expression translated “the human spirit” is the Hebrew term נִשְׁמַת (nishmat), a feminine noun in construct. This is the inner spiritual part of human life that was breathed in at creation (Gen 2:7) and that constitutes humans as spiritual beings with moral, intellectual, and spiritual capacities.
Proverbs 20:27 tn The comparative “like” does not appear in the Hebrew text, but is implied by the metaphor; it is supplied for the sake of clarity.
Proverbs 20:27 tn The “lamp” is the metaphor in the line; it signifies that the human spirit functions as a conscience, enabling people to know and please God, and directing them in choices that will be life-giving. E. Loewenstamm unnecessarily reads נִיר (nir, “to plow”) instead of נֵר (ner, “lamp”) to say that God plows and examines the soul (“Remarks on Proverbs 17:12 and 20:27, ” VT 37 [1967]: 233). The NIV supplies a verb (“searches”) from the second half of the verse, changing the emphasis somewhat.
Proverbs 20:27 tn Heb “all the chambers of the belly.” This means “the inner parts of the body” (BDB 293 s.v. חֶדֶר); cf. NASB “the innermost parts of his being.”

New English Translation (NET)