Matthew 18:5 teaches that receiving a child in Jesus' name receives Jesus — directly parallels the 'little ones' and promise of reward in Matthew 10:42.

In Matthew 18:10, these same 'little ones' have guardian angels before God, adding divine protection to the reason for serving them.

In Matthew 18:14, God's will is that none of these little ones perish, reinforcing the high value of those served with a cup of water.

In Matthew 25:40, serving the least of Christ's brothers is serving Christ himself, raising the reward for a cup of water to a personal act toward Jesus.

Matthew 6:1 warns against practicing righteousness for show, losing reward — contrast with the humble, unseen act of giving water.

In Matthew 16:27, Jesus says He will repay each according to deeds — this is the ultimate basis for the reward promised here.

In Matthew 6:4, Jesus teaches that the Father rewards secret giving — here the same promise applies to small acts for disciples, with reward assured.

In Mark 9:42, harming a little one brings severe punishment, contrasting the reward promised for helping them in this verse.

In Hebrews 6:10, God does not overlook love shown to the saints — directly affirming that such service is remembered and rewarded.

In Philippians 4:15-19, Paul acknowledges gifts and promises God's supply — showing that support for gospel workers brings blessing.

In 2 Corinthians 9:6-15, generous sowing leads to abundant reaping — illustrating the same principle of reward for cheerful giving.

In 2 Corinthians 8:12, willingness to give according to ability is acceptable — reinforcing that God rewards what we can offer.

In Luke 17:2, causing a little one to sin is worse than drowning — a warning opposite to the blessing of giving them a cup of water.

In Mark 9:41, the same promise appears: giving a cup of water in Christ's name guarantees a reward — a direct parallel account.

Ruth 2:12 promises a full reward from God for loyalty — parallel to the reward promised in Matthew for hospitality.

Proverbs 19:17 directly parallels: giving to the poor is lending to God, who repays — exactly the logic of the cup of water reward.

In Ephesians 6:8, Paul promises the Lord will repay each for good done to others — directly reinforcing the certainty of reward for the cup of cold water here.

2 Kings 4:10 describes the Shunammite woman providing a room for Elisha — a parallel act of hospitality to a prophet.

1 Kings 17:11 recounts the widow giving water to Elijah — a strong parallel to giving a cup of water to a disciple.

In Luke 6:35, loving enemies and doing good without expecting return yields great reward — expanding the principle to adversaries.

In Luke 14:14, Jesus promises resurrection reward for serving those who cannot repay — similar to the reward for giving a cup of water to a disciple here.

In 2 Timothy 1:16, Onesiphorus refreshing Paul exemplifies the kind of care for believers that Jesus says will be rewarded.

In Luke 6:38, Jesus promises abundant return for giving — this echoes the assurance of reward for the small kindness described here.

In Acts 28:2, the Maltese show unusual kindness to Paul and companions — a real example of the kind act rewarded in this verse.

In 1 Corinthians 3:8, Paul says each will receive wages according to labor — this matches the promised reward for even small service here.

In Nehemiah 5:19, he asks God to remember his good deeds for the people — mirroring the promise that even small acts for God's people are remembered.

In 2 Corinthians 8:4, the Macedonians eagerly desire to contribute to the saints — an example of the giving that earns reward here.