Quote (njaguar @ Feb 15 2020 08:33am)

Jesus spoke much on hell, it's eternality, and it's severity. Here are a few examples:

Matthew 25:41-46 English Standard Version (ESV)
41 “Then he will say to those on his left, ‘Depart from me, you cursed, into the eternal fire prepared for the devil and his angels. 42 For I was hungry and you gave me no food, I was thirsty and you gave me no drink, 43 I was a stranger and you did not welcome me, naked and you did not clothe me, sick and in prison and you did not visit me.’ 44 Then they also will answer, saying, ‘Lord, when did we see you hungry or thirsty or a stranger or naked or sick or in prison, and did not minister to you?’ 45 Then he will answer them, saying, ‘Truly, I say to you, as you did not do it to one of the least of these, you did not do it to me.’ 46 And these will go away into eternal punishment, but the righteous into eternal life.”

One key note here is the word for eternal is the same Jesus uses to speak of His new Kingdom and Heaven. If hell is not eternal, then neither is Heaven.

Luke 16:19-31 English Standard Version (ESV)
The Rich Man and Lazarus
19 “There was a rich man who was clothed in purple and fine linen and who feasted sumptuously every day. 20 And at his gate was laid a poor man named Lazarus, covered with sores, 21 who desired to be fed with what fell from the rich man's table. Moreover, even the dogs came and licked his sores. 22 The poor man died and was carried by the angels to Abraham's side. The rich man also died and was buried, 23 and in Hades, being in torment, he lifted up his eyes and saw Abraham far off and Lazarus at his side. 24 And he called out, ‘Father Abraham, have mercy on me, and send Lazarus to dip the end of his finger in water and cool my tongue, for I am in anguish in this flame.’ 25 But Abraham said, ‘Child, remember that you in your lifetime received your good things, and Lazarus in like manner bad things; but now he is comforted here, and you are in anguish. 26 And besides all this, between us and you a great chasm has been fixed, in order that those who would pass from here to you may not be able, and none may cross from there to us.’ 27 And he said, ‘Then I beg you, father, to send him to my father's house— 28 for I have five brothers—so that he may warn them, lest they also come into this place of torment.’ 29 But Abraham said, ‘They have Moses and the Prophets; let them hear them.’ 30 And he said, ‘No, father Abraham, but if someone goes to them from the dead, they will repent.’ 31 He said to him, ‘If they do not hear Moses and the Prophets, neither will they be convinced if someone should rise from the dead.’”

This is a parable that shows many different things, but key to your question involves the "great chasm fixed" that divides Heaven from hell.

Mark 9:42-48 English Standard Version (ESV)
Temptations to Sin
42 “Whoever causes one of these little ones who believe in me to sin, it would be better for him if a great millstone were hung around his neck and he were thrown into the sea. 43 And if your hand causes you to sin, cut it off. It is better for you to enter life crippled than with two hands to go to hell, to the unquenchable fire. 45 And if your foot causes you to sin, cut it off. It is better for you to enter life lame than with two feet to be thrown into hell. 47 And if your eye causes you to sin, tear it out. It is better for you to enter the kingdom of God with one eye than with two eyes to be thrown into hell, 48 ‘where their worm does not die and the fire is not quenched.’

Speaking on temptations, He also firmly admonishes those that follow Him to no longer be slaves to sin (Rom 6:15-23)

Luke 13:22-30 English Standard Version (ESV)
The Narrow Door
22 He went on his way through towns and villages, teaching and journeying toward Jerusalem. 23 And someone said to him, “Lord, will those who are saved be few?” And he said to them, 24 “Strive to enter through the narrow door. For many, I tell you, will seek to enter and will not be able. 25 When once the master of the house has risen and shut the door, and you begin to stand outside and to knock at the door, saying, ‘Lord, open to us,’ then he will answer you, ‘I do not know where you come from.’ 26 Then you will begin to say, ‘We ate and drank in your presence, and you taught in our streets.’ 27 But he will say, ‘I tell you, I do not know where you come from. Depart from me, all you workers of evil!’ 28 In that place there will be weeping and gnashing of teeth, when you see Abraham and Isaac and Jacob and all the prophets in the kingdom of God but you yourselves cast out. 29 And people will come from east and west, and from north and south, and recline at table in the kingdom of God. 30 And behold, some are last who will be first, and some are first who will be last.”

This goes hand in hand with the parable in Matthew 22:1-14, ending: 13 Then the king said to the attendants, ‘Bind him hand and foot and cast him into the outer darkness. In that place there will be weeping and gnashing of teeth.’ 14 For many are called, but few are chosen.”

Matthew 7:12-27 contains four more parables on hell, which have other corresponding recordings on the other gospels.

John 3:36 English Standard Version (ESV)
36 Whoever believes in the Son has eternal life; whoever does not obey the Son shall not see life, but the wrath of God remains on him.

John 5:24 English Standard Version (ESV)
24 Truly, truly, I say to you, whoever hears my word and believes him who sent me has eternal life. He does not come into judgment, but has passed from death to life.

Whereas the opposite of believing and eternal life is eternal wrath and damnation (hell), as indicated by passing from death to life.

Every NT author speaks of hell, and these are but a few of the many examples of where Christ specifically spoke on them. There are numerous others, but this should give you a good jump start towards looking into others.

*note: I have not watched the original post's video, so I cannot speak towards whether it is accurate scripturally or not. I will let God's Word speak for itself.