Albert Barnes Commentary Matthew 26:68

"saying, Prophesy unto us, thou Christ: who is he that struck thee?" — Matthew 26:68 (ASV)

Saying, Prophesy to us, etc. Mark informs us that before they said this, they had blindfolded him. Having prevented him from seeing, they ridiculed his claims of being the Messiah. If he was the Christ, they supposed he could tell who struck him. As he bore it patiently and did not answer, they doubtless supposed they had discovered another reason to think he was an impostor.

The word 'prophesy' here does not mean only to foretell future events—although that is the proper meaning of the word—but also to declare anything that is unknown, or anything that cannot be known by natural knowledge or without revelation.

Luke adds, And many other things blasphemously spake they against him. There is something very remarkable in this statement. They had charged him with blasphemy for claiming to be the Son of God. This charge they were not able to prove. But the evangelist fixes the charge of blasphemy on them, because he really was the Son of God, and they denied it.