Verse 26 states 'the earth is the Lord's' as basis for freedom to eat; verse 28 then qualifies that freedom for the sake of conscience.

In 1 Cor 8:10-13, Paul warns that eating in an idol's temple may cause a weaker brother to sin—directly paralleling the conscience concern here.

1 Corinthians 8:7 introduces the weak conscience that is defiled by eating idol food—the very conscience Paul says to respect here.

Deuteronomy 10:14 states heaven and earth belong to the Lord, supporting Paul's claim that all food is clean, yet conscience may limit freedom.

Psalm 24:1 is the direct source of Paul's quote in verse 26: 'The earth is the Lord's'—establishing God's ownership over all creation.

Romans 14:15 says not to destroy the one for whom Christ died by your food, reinforcing the love principle behind refraining when it offends.

Numbers 25:2 shows Israelites eating sacrifices to other gods and bowing — a vivid example of the very danger Paul warns against when eating idol meat.

Psalm 141:4 prays not to eat delicacies of wicked men — directly parallels Paul's warning to avoid food tied to idolatry for conscience sake.

Daniel 1:8 shows Daniel refusing pagan food to avoid defilement—parallel to Paul's instruction to avoid eating when informed it's idol food.

Acts 15:20 is the apostolic decree to abstain from food polluted by idols—the same issue Paul addresses here about conscience.