אֲנִי֙ פִּי־מֶ֣לֶךְ שְׁמ֔וֹר וְעַ֕ל דִּבְרַ֖ת שְׁבוּעַ֥ת אֱלֹהִֽים׃
I [counsel thee]: keep the king’s command, and that in regard of the oath of God.
Rashi on Ecclesiastes
My [advice to you is] keep the King’s command. Therefore, I need to and I am prepared to observe the commandment of the King of the Universe, which is the best of them all.
Kohelet Rabbah
“I observe the king’s command, and the word of an oath to God” (Ecclesiastes 8:2).
“I observe the king’s command.” Rabbi Levi said: I will observe the word of the King of kings, the Holy One blessed be He, the mouth which said: “I am the Lord your God” (Exodus 20:2); “and the word” – “you shall not have [another god before Me]” (Exodus 20:3); “of an oath” – “You shall not take the name of the Lord your God in vain” (Exodus 20:7).
“I observe the king’s command.” Rabbi Levi said: I will observe the word of the King of kings, the Holy One blessed be He, the mouth which said: “I am the Lord your God” (Exodus 20:2); “and the word” – “you shall not have [another god before Me]” (Exodus 20:3); “of an oath” – “You shall not take the name of the Lord your God in vain” (Exodus 20:7).
Rashi on Ecclesiastes
And do so because of the oath to God. Which we swore to Him at Choreiv, to keep His commandments.