Commentaries:
Jamieson, Fausset, and Brown
temple of his body—in which was enshrined the glory of the eternal Word. (See on John 1:14). By its resurrection the true Temple of God upon earth was reared up, of which the stone one was but a shadow; so that the allusion is not quite exclusively to Himself, but takes in that Temple of which He is the foundation, and all believers are the "lively stones." (I Peter 2:4-5).
What sign showest thou unto us, seeing that thou doest these things?—Though the act and the words of Christ, taken together, were sign enough, they were unconvinced: yet they were awed, and though at His very next appearance at Jerusalem they "sought to kill Him" for speaking of "His Father" just as He did now (John 5:18), they, at this early stage, only ask a sign.
Other Jamieson, Fausset, and Brown entries containing John 2:21:
Song of Solomon 1:4
Song of Solomon 3:6
Isaiah 4:5
Daniel 9:24
Zechariah 3:9
Zechariah 4:7
Mark 14:58
Luke 19:45-46
John 2:14-17
John 2:14-17
Colossians 1:19
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