18 Then the Jews put this question to him: What sign of authority have you to give us, seeing that you do these things? 19 And Jesus said to them, Send destruction on this Temple and I will put it up again in three days. 20 The Jews said, The building of this Temple took forty-six years; and you will put it up in three days! 21 But his words were about that holy building which was his body. 22 So when he had come back again from the dead, the memory of these words came back to the disciples, and they had faith in the holy Writings and in the word which Jesus had said.
Matthew Henry's Commentary on John 2:18-22
Commentary on John 2:12-22
(Read John 2:12-22)
The first public work in which we find Christ engaged, was driving from the temple the traders whom the covetous priests and rulers encouraged to make a market-place of its courts. Those now make God's house a house of merchandise, whose minds are filled with cares about worldly business when attending religious exercises, or who perform Divine offices for love of gain. Christ, having thus cleansed the temple, gave a sign to those who demanded it, to prove his authority for so doing. He foretells his death by the Jews' malice, Destroy ye this temple; I will permit you to destroy it. He foretells his resurrection by his own power; In three days I will raise it up. Christ took again his own life. Men mistake by understanding that according to the letter, which the Scripture speaks by way of figure. When Jesus was risen from the dead, his disciples remembered he has said this. It helps much in understanding the Divine word, to observe the fulfilling of the Scriptures.