Q: Context: "Separation of church and state" is paraphrased from Thomas Jefferson and used by others in expressing an understanding of the intent and function of the Establishment Clause and Free Exercise Clause of the First Amendment to the Constitution of the United States which reads: "Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof ..."

Question: where is the expression of separation of church and state found in the constitution? Let's give stream of consciousness first:
The relevant information to answer the above question is: "Separation of church and state" is paraphrased from Thomas Jefferson and used by others in expressing an understanding of the intent and function of the Establishment Clause and Free Exercise Clause of the First Amendment to the Constitution of the United States which reads: "Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof ..." Therefore, the final answer is the Establishment Clause and Free Exercise Clause of the First Amendment.