John Chrysostom

Could then anything be more foolish than these men (not more impious only), who after so many miracles, as though none had been wrought, say, "We would see a sign from Thee?" With what intent then did they so speak? That they might lay hold of Him again. For since by His words He had stopped their mouths, once and twice and often, and had checked their shameless tongue, they come to His works again. At which also the evangelist marvelling again, said, "Then certain of the scribes answered Him, asking a sign." "Then," when? …

Homily on the Gospel of Matthew 43 ↗

Theophylact of Ohrid

The evangelist is amazed and so writes the word "then." For when they should have submitted to Him because of His preceding miracles, it was then that they asked for a sign. They wanted to see a sign from heaven, as the other evangelist says (Lk. 11:16). For they thought that He performed the miracles which He did on earth by the power of the devil, as the devil is the ruler of this world. How, then, does the Saviour answer?

Commentary on Matthew ↗

Jerome

Then some of the scribes and Pharisees answered him, saying, "Teacher, we want to see a sign from you." They demand a sign as if the signs they had seen were not enough. But in another Gospel it is explained more fully what they are asking for: "We want to see a sign from heaven" (Mark 8:11). …

Commentary on Matthew ↗

Thomas Aquinas

Having answered those who maligned his miracles and doctrine, the Lord now deals with those testing him: first, a question testing him is presented; secondly, the reproval. He says, therefore, Then they said to him... This is after they had seen many miracles and heard many words of wisdom, to fulfill what was said in Sirach (22:7): "He who teaches a fool is like talking to a person asleep." Teacher, we wish to see a sign from you. …

Commentary on Matthew ↗