'Fourth Generation' in the Bible

Your descendants will return here in the fourth generation, since the iniquity of the Amorites has not yet run its course."

You are not to bow down to them in worship or serve them, because I, the LORD your God, am a jealous God, visiting the guilt of parents on children, to the third and fourth generation of those who hate me,

He graciously loves thousands, and forgives iniquity, transgression, and sin. But he does not leave the guilty unpunished, visiting the iniquity of the ancestors on their children, and on their children's children to the third and fourth generation."

"The LORD is slow to anger and abundant in faithful love, forgiving iniquity and transgression, but he won't acquit the guilty. He recalls the iniquity of fathers to the third and fourth generation.'

You are not to bow down to them in worship or serve them, because I, the LORD your God, am a jealous God, visiting the guilt of parents on children, to the third and fourth generation of those who hate me,

Nevertheless, the LORD told Jehu, "Because you have done well in carrying out what I saw as the right thing to do by completing everything I had in mind regarding Ahab's dynasty, your sons will sit on the throne of Israel to the fourth generation."

Job lived 140 years after this, and saw his children and grandchildren to the fourth generation.