NIV
Sign of Jonah
38 Then some of the Pharisees and teachers of the law said to him, “Teacher, we want to see a sign from you.”
39 He answered, “A wicked and adulterous generation asks for a sign! But none will be given it except the sign of the prophet Jonah.
40 For as Jonah was three days and three nights in the belly of a huge fish, so the Son of Man will be three days and three nights in the heart of the earth.
41 The men of Nineveh will stand up at the judgment with this generation and condemn it; for they repented at the preaching of Jonah, and now something greater than Jonah is here.
42 The Queen of the South will rise at the judgment with this generation and condemn it; for she came from the ends of the earth to listen to Solomon’s wisdom, and now something greater than Solomon is here.

ERV
Some People Doubt Jesus’ Authority
(Mk. 8:11–12; Lk. 11:29–32)
38 Then some of the Pharisees and teachers of the law answered Jesus. They said, “Teacher, we want to see you do a miracle as a sign from God.”
39 Jesus answered, “Evil and sinful people are the ones who want to see a miracle as a sign. But no miracle will be done to prove anything to them. The only sign will be the miracle that happened to the prophet Jonah.f
40 Jonah was in the stomach of the big fish for three days and three nights. In the same way, the Son of Man will be in the grave three days and three nights.
41 On the judgment day, you people who live now will be compared with the people from Nineveh,g and they will be witnesses who show how guilty you are. Why do I say this? Because when Jonah preached to those people, they changed their lives. And you are listening to someone greater than Jonah, but you refuse to change!
42 “On the judgment day, you people who live now will also be compared with the queen of the South,h and she will be a witness who shows how guilty you are. I say this because she traveled from far, far away to listen to Solomon’s wise teaching. And I tell you that someone greater than Solomon is right here, but you won’t listen!

NKJV
The Scribes and Pharisees Ask for a Sign
38 Then some of the scribes and Pharisees answered, saying, “Teacher, we want to see a sign from You.”
39 But He answered and said to them, “An evil and adulterous generation seeks after a sign, and no sign will be given to it except the sign of the prophet Jonah.
40 For as Jonah was three days and three nights in the belly of the great fish, so will the Son of Man be three days and three nights in the heart of the earth.
41 The men of Nineveh will rise up in the judgment with this generation and condemn it, because they repented at the preaching of Jonah; and indeed a greater than Jonah is here.
42 The queen of the South will rise up in the judgment with this generation and condemn it, for she came from the ends of the earth to hear the wisdom of Solomon; and indeed a greater than Solomon is here.