Scripture best explains scripture. Interpreting what is here said in reference to the days of Christ, the whole is confirmed. Psalms 72:10-11.
Related Commentaries of Psalms 138:4
Psalms 138:4-5
4 All the kings of the earth shall praise thee, O LORD, when they hear the words of thy mouth.
5 Yea, they shall sing in the ways of the LORD: for great is the glory of the LORD.