כִּ֤י חֹ֣ק לְיִשְׂרָאֵ֣ל ה֑וּא מִ֝שְׁפָּ֗ט לֵאלֹהֵ֥י יַעֲקֹֽב׃
For it is a statute for Israel, an ordinance of the God of Jacob.
Rashi on Psalms
For it is a statute for Israel from the Holy One, blessed be He, to sound the shofar on that day, the day of the judgment of the Holy One, blessed be He.