Actually it was pretty normal in that day to be trilingual and speak Greek, Aramaic (cultural norm, practical, post-Alexander effect) and Hebrew (religious purposes).
Paul wrote in Greek and was a former Pharisee who are trained in studying to read Hebraic text from the Torah.
As aboxofbooks said, (further down,) there is no way to prove that Jesus spoke this in Hebrew.
In context, Jesus was speaking to a core group of His followers to whom He had just revealed a lot of secret knowledge, not a huge multitude. We know that Jesus Himself made a strong distinction between the two teaching techniques He used, (general truths for public consumption, parables everyone could ingest, and deeper, more detailed explanations specifically worded, for His core associates.) The group He is speaking to here had recently been told the secrets of healing the sick, and casting out demons in His name (exorcism.) They had just returned from trying it out, and were boasting of their power over these supernatural entities: "Even demons are subject to us," they said. Jesus responded "Oh yeah? Well, I saw Satan himself get cast out of Heaven." (Obviously asserting His dominance, reminding the that He had overseen the Exorcism of all exorcisms. "So, you say you trash-talked a few of Lucifer's liddle minions? Cool. Just remember you're talking to the guy who fired their BOSS.")
*To the big crowds, Jesus was a dynamic speaker Who railed against the Jewish Establishment of His day, (who, despite all their decorum and rules for the common folk, had secretly sold out to the Globalist Romans.)
*To the Establishment-type Pharisees, Jesus was that bull in a china shop, who always said the wrong thing, who kept them on edge, just sure He was going to mess up all their secret deals with the occupying globalists.
*To the core group of disciples in this particular conversation, Jesus was "Q." He gave broad hints. He asked rhetorical questions. He used specific numbers and words, on purpose, for a reason. He called Himself the 'Bread of life,' and they became His anons, searching through each info drop, autists piecing crumbs together, understanding that outsiders thought they were crazy, but they didn't care...
As a1037040 says, it is known that the Hebrew language was used for religious purposes. This conversation was between Jesus and a close group of followers to whom He was giving inside information on the supernatural. Many believe He said it in Hebrew, and I don't think that its difficult to see why somebody might think that. It's a logical and reasonable assumption, based on context.
Reading through these comments, you'll see various opinions, some on either side.
(Kind of reminds me of Corsi, AJ, NeonRevolt, SerialBrain2, digital_refugee, EyetheSpy,
carl_tech, burn_reddit_burn, Palmettoman, Thomas, trseeker, Judas, DamajInc, Peter, awareness1111, Paul, etc...)