Helaman 5:4

And it came to pass that Nephi had become weary, because of their iniquity; and he yielded up the judgement seat, and took it upon him to preach the word of God all the remainder of his days, and his brother Lehi also, all the remainder of his days:

Nephi had become tired because of their sins. He gave up the judgment seat. He spent the rest of his days preaching God’s word. His brother Lehi did the same for the rest of his days.

Nephi had grown weary of their wickedness. So he gave up the chief judge’s seat and committed himself to preaching God’s word for the rest of his life. His brother Lehi did the same.