His disciples remembered that it was written, "Zeal for your house will eat me up."
"We should not miss the way this incident fits in with John’s aim of showing Jesus to be the Messiah. All his actions imply a special relationship with God. They proceed from his messianic vocation. The citation from Scripture is important from another point of view, for it accords with another habit of this Evangelist. While John does not quote the Old Testament as frequently as do some other New Testament writers, it is still the case, as Richard Morgan says, that ’the Old Testament is present at every crucial moment in the Gospel.’ It is one of John’s great themes that in Jesus God is working his purposes out. Every critical moment sees the fulfillment of Scripture in which those purposes are set forth." [Note: Morris, p. 172.] 