John Gill Commentary Psalms 138:4

"All the kings of the earth shall give thee thanks, O Jehovah, For they have heard the words of thy mouth." — Psalms 138:4 (ASV)

All the kings of the earth shall praise you, O Lord
Or "let [them] confess", or "praise you" ^F19 ; a wish or prayer. Not only the kings known to David, as Kimchi limits it; or that lived in his days, as Hiram and others; but in the latter day, when they shall come to Zion, the church, and be nursing fathers to it, and shall serve and worship the King Messiah, (Isaiah 49:23) (Isaiah 60:3Isaiah 60:11Isaiah 60:16) (Psalms 72:10Psalms 72:11) ;

when they hear the words of your mouth ;
either the promises of it fulfilled not only with respect to David; but the Messiah, and his church and people, in the latter day, even the glorious things spoken thereof: or the doctrines of the Gospel, which are the words of his mouth, and more desirable than thousands of gold and silver; and which, when kings shall hear so as to understand, they will praise the Lord for them; see (Isaiah 52:15) . The Targum is,

``the words of your praise.''

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FOOTNOTES:

• F19: (Kwdwy) "confiteantur tibi", V. L. Pagninus, Montanus.