tnHeb “[As for] the God, his way is blameless.” The term הָאֵל (ha’el, “the God”) stands as a nominative (or genitive) absolute in apposition to the resumptive pronominal suffix on “way.” The prefixed article emphasizes his distinctiveness as the one true God (see BDB 42s.v. II אֵל 6; Deut 33:26). God’s “way” in this context refers to his protective and salvific acts in fulfillment of his promise (see also Deut 32:4; Pss 67:2; 77:13 [note vv. 11–12, 14]; 103:7; 138:5; 145:17).
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tnHeb “the word of the Lord is purified.” The Lord’s “word” probably refers here to his oracle(s) of victory delivered to the psalmist before the battle(s) described in the following context. See also Pss 12:5–7 and 138:2–3. David frequently received such oracles before going into battle (see 1 Sam 23:2, 4–5, 10–12; 30:8; 2 Sam 5:19). The Lord’s word of promise is absolutely reliable; it is compared to metal that has been refined in fire and cleansed of impurities. See Ps 12:6. In the ancient Near East kings would typically seek and receive oracles from their god(s) prior to battle. For examples, see R. B. Chisholm, “An Exegetical and Theological Study of Psalm 18/2 Samuel 22” (Th.D. diss., Dallas Theological Seminary, 1983), 241–42.