'Ancestors' in the Bible

When your days [are] full and you lie down with your ancestors, I will raise up your offspring after you who will go out from your body, and I will establish his kingdom.

When Ahithophel saw that his advice [was] not followed, he saddled the donkey, and he set out and went up to his house in his city. {After he set his house in order}, he hanged himself, and he died and was buried in the tomb of his ancestors.