What is the Scripture that Jesus quotes from the Old Testament?
Mark 11:17 (ESV)
17And he was teaching them and saying to them, “Is it not written, ‘My house shall be called a house of prayer for all the nations’? But you have made it a den of robbers.”
He gives a clear quote from Isaiah 56:7, and a reference to Jeremiah 7:11. Mark does this more often. He gives a double quote (see e.g., Mark 1:2–3: a quote from Isaiah 40:1–31 and Malachi 3:1–18).
17 And he was teaching them and saying to them, “Is it not written, ‘My house shall be called a house of prayer for all the nations’? But you have made it a den of robbers.”