“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 and the Oath to God
Kohelet Rabbah 2:1