As Nephi say in 2 Nephi 28:7, “there shall be many which shall say: Eat, drink, and be merry, for tomorrow we die; and it shall be well with us.” But what does that mean? It means that some people say that it’s okay to do sin if you won’t have another chance, in this example, if the next day they will die. What about the next verse? “And there shall also be many which shall say: Eat, drink, and be merry; nevertheless, fear God—he will justify in committing a little sin; yea, lie a little, take the advantage of one because of his words, dig a pit for thy neighbor; there is no harm in this; and do all these things, for tomorrow we die; and if it so be that we are guilty, God will beat us with a few stripes, and at last we shall be saved in the kingdom of God.” Some people will say that it’s okay to just a little sin. When we get to heaven, we will be punished for a few minutes, then we’ll be fine and happy. But there’s a problem with that. Once you do something, a little more seems fine. For example, 1 is a small number. 2 is just a little more than 1, so it’s also small. Same with 3, 4, 5, and so on and so on. But God doesn’t want you to do any sin in the first place. So what Nephi is teaching is that we shouldn’t sin.
https://www.churchofjesuschrist.org/study/scriptures/bofm/2-ne/28?lang=eng&verse=#p