Ecclesiastes 2:26 directly explains the mechanism of 2:18: God gives the sinner's gathered wealth to one who pleases Him, making the laborer's hatred understandable.

Ecclesiastes 2:4-9 lists the great works that 2:18 refers to as hated toil — the specific achievements that must be left behind.

In Ecclesiastes 2:21, the same idea is expanded: one must leave everything to someone who did not work for it — a direct continuation of the complaint.

In Ecclesiastes 5:18, the Preacher offers a contrasting view: labor and its fruits are a gift to be enjoyed, not hated because they pass to an heir.

Ecclesiastes 5:14 illustrates the same fear of 2:18: wealth lost before passing to the son, leaving the laborer with nothing for his heir.

Ecclesiastes 9:9 echoes the toil theme but redirects to present joy with family as one's portion, addressing the frustration of leaving labor to another.

Ecclesiastes 5:13 describes another vanity: riches that harm their owner, paralleling the frustration of labor that cannot be kept from 2:18.

Ecclesiastes 1:13 describes the heavy burden of exploring wisdom — the same kind of toil whose futility 2:18 laments.

1 Kings 11:11-13 provides a historical example of a king losing his kingdom to a servant, mirroring the Preacher's complaint in Ecclesiastes 2:18 about leaving labor to a successor.

1 Corinthians 3:10 uses the same building metaphor: one lays a foundation, another builds—Paul embraces succession, contrasting Ecclesiastes' despair.

Luke 12:16-21 tells the parable of a rich fool who stores up treasure but dies, leaving it to others — a vivid illustration of Ecclesiastes 2:18's frustration.

Psalm 49:10 states plainly that both wise and foolish leave their wealth to others, exactly the point of Ecclesiastes 2:18.

Psalm 39:6 echoes the same futility: man heaps wealth but does not know who will gather it, directly supporting Ecclesiastes 2:18's lament.

Psalm 17:14 describes the worldly who leave wealth to their children — the very situation that causes the Preacher's frustration in Ecclesiastes 2:18.

Proverbs 19:13 says a foolish son is ruin to his father — directly reinforcing the Preacher's concern about leaving his toil to an unworthy heir.

In Proverbs 17:25, a foolish son grieves his father — illustrating why the Preacher dreads leaving his work to an heir who may be a fool.

In Job 21:21, the wicked man cares nothing for his house after death — directly mirroring the Preacher's hatred of leaving his labor to an heir.

2 Chronicles 6:10 has Solomon faithfully succeeding David and building the temple—the ideal opposite of the Preacher's dread of an unworthy heir.

1 Kings 14:26 recounts Shishak plundering Solomon's treasures—the Preacher's nightmare: one's wealth and legacy seized by others.

Exodus 1:8 describes a new king who forgot Joseph—a clear example of labor lost to an unknown successor, exactly the Preacher's dread.

In Job 14:21, the dead do not know their children's fate — echoing the Preacher's frustration over leaving his toil to an unknown heir.

Proverbs 27:11 desires a wise son to bring joy — the positive flip side of the Preacher's anxiety about who will inherit his labor.

Esther 8:1 shows Haman's estate given to Esther and Mordecai—a surprising transfer of wealth, echoing the uncertainty of who receives one's labor.

Daniel 11:4 describes a kingdom divided among others not the king's posterity, mirroring the frustration of leaving labor to an unknown heir.