Here are 8 Bible verses about sudden death from the Old and New Testaments of the Holy Bible (King James Version), sorted from most to least relevant.
1 Samuel 25:36-38 KJV
And Abigail came to Nabal; and, behold, he held a feast in his house, like the feast of a king; and Nabal’s heart was merry within him, for he was very drunken: wherefore she told him nothing, less or more, until the morning light. But it came to pass in the morning, when the wine was gone out of Nabal, and his wife had told him these things, that his heart died within him, and he became as a stone. And it came to pass about ten days after, that the LORD smote Nabal, that he died.
Job 21:23 KJV
One dieth in his full strength, being wholly at ease and quiet.
Proverbs 28:18 KJV
Whoso walketh uprightly shall be saved: but he that is perverse in his ways shall fall at once.
Job 27:21 KJV
The east wind carrieth him away, and he departeth: and as a storm hurleth him out of his place.
Acts 20:7-12 KJV
And upon the first day of the week, when the disciples came together to break bread, Paul preached unto them, ready to depart on the morrow; and continued his speech until midnight. And there were many lights in the upper chamber, where they were gathered together. And there sat in a window a certain young man named Eutychus, being fallen into a deep sleep: and as Paul was long preaching, he sunk down with sleep, and fell down from the third loft, and was taken up dead. And Paul went down, and fell on him, and embracing him said, Trouble not yourselves; for his life is in him. When he therefore was come up again, and had broken bread, and eaten, and talked a long while, even till break of day, so he departed. And they brought the young man alive, and were not a little comforted.
Job 34:20 KJV
In a moment shall they die, and the people shall be troubled at midnight, and pass away: and the mighty shall be taken away without hand.
Acts 12:23 KJV
And immediately the angel of the Lord smote him, because he gave not God the glory: and he was eaten of worms, and gave up the ghost.
Job 21:13 KJV
They spend their days in wealth, and in a moment go down to the grave.