In Romans 4:4, wages are owed to workers as a debt, contrasting gift—this clarifies that God is not indebted to anyone.

In Job 35:7, Elihu asks what man's righteousness gives to God — the same rhetorical question about no one being able to put God in debt.

Job 41:11 is the direct source of Paul's quote: 'Who has first given to Me, that I should repay him?' — a clear Old Testament citation.

In Matthew 20:15, the landowner asks if he may do what he wishes with his own — likewise affirming God's right to give without being indebted.

In 1 Corinthians 4:7, Paul asks 'what do you have that you did not receive?' — reinforcing that no one can first give to God, as Romans 11:35 states.

1 Chronicles 29:12 declares all riches and honor come from God alone — nothing given to Him can create a debt, reinforcing Romans 11:35's point.

Psalm 16:2 says 'I have no good apart from you' — all goodness originates with God, so no gift to Him can require repayment.

Luke 15:31 shows the father saying 'all that is mine is yours' — everything is already a gift, reinforcing that no one can give God something first.

Luke 17:10 teaches that servants only do their duty — no claim on God, parallel to Romans 11:35's question that no one can give to God that He must repay.

In Acts 17:25, Paul says God is not served by human hands as if He needed anything, reinforcing that no one can give to God to be repaid.