18 The Jews then said to him, "What sign can you show us for doing this?" 19 Jesus answered them, "Destroy this temple, and in three days I will raise it up." 20 The Jews then said, "This temple has been under construction for forty-six years, and will you raise it up in three days?" 21 But he was speaking of the temple of his body. 22 After he was raised from the dead, his disciples remembered that he had said this; and they believed the scripture and the word that Jesus had spoken.
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.