Ecclesiastes 9:6 states the dead have no part in anything under the sun, reinforcing that labor's gain vanishes after death.

Ecclesiastes 9:3 notes that death overtakes everyone, rendering any gain from labor ultimately meaningless—echoing 1:3's futility.

Ecclesiastes 2:11 answers the question of 1:3: all labor is meaningless, a chasing after wind — nothing gained. Direct continuation.

In Ecclesiastes 2:22, the same question about gain from toil is repeated, emphasizing the futility of labor.

Ecclesiastes 3:9 asks the identical question about the worker's gain, reinforcing the theme of toil's emptiness.

Ecclesiastes 4:3 declares that never being born is better than seeing evil—a radical response to the futility of labor asked in 1:3.

Ecclesiastes 4:7 shows solitary toil without anyone to share it, illustrating that labor's 'gain' is empty without relationship.

Ecclesiastes 5:16 expands on gainless toil for wind, directly echoing the query in 1:3 about labor's profit.

Ecclesiastes 5:18 answers the gain question: satisfaction in labor and enjoying God's gifts is the true benefit under the sun.

Ecclesiastes 6:12 deepens the uncertainty—no one knows what is good or what comes after, making labor's gain unknowable.

Ecclesiastes 8:15-17 advises enjoying life despite not comprehending God's work—a practical response to the futility of labor.

Ecclesiastes 7:11 praises wisdom as a genuine benefit, offering a counterpoint to the apparent futility of labor in 1:3.

Habakkuk 2:13 says people exhaust themselves for nothing, mirroring Ecclesiastes' rhetorical question — labor is fuel for fire, no gain.

John 6:27 contrasts labor for perishable food with work for eternal food — directly opposes Ecclesiastes' 'under the sun' futility.

Matthew 16:26 asks what good to gain the world but lose one's soul — parallels Ecclesiastes' question about gain, with eternal stakes.

Mark 8:36 is identical to Matthew 16:26 — same question about worldly gain vs. soul, echoing Ecclesiastes' theme of futile labor.

Mark 8:37 continues: what can exchange for a soul? It deepens the parallel with Ecclesiastes' 'what does man gain?'.

Isaiah 55:2 asks why labor for what does not satisfy, directly paralleling Ecclesiastes' question about the gain of toil — both point to futility.

In Genesis 3:19, the curse of labor for survival grounds the futility of toil in Ecclesiastes — human effort yields no lasting gain.

Genesis 3:19 describes the curse of toil and death—the origin of the futility behind Ecclesiastes 1:3's question about labor's gain.

Proverbs 23:5 depicts riches flying away like an eagle, echoing Ecclesiastes' question about gain from labor — both declare earthly gain fleeting.

Proverbs 23:4 warns against exhausting toil for wealth, aligning with the futility of labor questioned in 1:3.