In Romans 10:19, who is quoted first as saying, 'I will make you jealous by those who are not a nation'?

Answer: Moses

Paul writes, "First, Moses says: 'I will make you jealous by those who are not a nation'" (KJV: "provoke you to jealousy").

“I ask instead, did Israel not understand? First, Moses says: “I will make you jealous by those who are not a nation; I will make you angry by a nation without understanding.””— Romans 10:19 (BSB)