Adam Clarke's Bible Commentary Verse 1. In Judah is God known ] The true God revealed himself to the Jews. The Israelites, after the separation of the tribes, had the same knowledge, but they greatly corrupted the Divine worship; though still God was great, even in Israel.
Matthew Henry Commentary
Verses 1-6 - Happy people are those who have their land filled with the knowledge of God! happy persons that have their hearts filled with that knowledge It is the glory and happiness of a people to have God among them by his ordinances. Wherein the enemies of the church deal proudly, it wil appear that God is above them. See the power of God's rebukes. With pleasure may Christians apply this to the advantages bestowed by the Redeemer.
Original Hebrew למנצח5329 בנגינת5058 מזמור4210 לאסף623 שׁיר׃7892 נודע3045 ביהודה3063 אלהים430 בישׂראל3478 גדול1419 שׁמו׃8034