Exodus 23:5
If thou see the ass of him that hateth thee lying under his burden, and wouldest forbear to help him, thou shalt surely help with him.
Cross-reference
Deuteronomy 22:4 reiterates helping a fallen animal but for a brother, reinforcing this duty even for an enemy.
Leviticus 19:18's love for neighbor covers helping an enemy's animal, as seen in this rescue command.
In Proverbs 25:21, this same principle of aiding an enemy's physical needs is explicitly applied to giving food and drink.
In Matthew 5:44, Jesus extends the command from helping an enemy's animal to loving and praying for them.
In Matthew 12:11, Jesus uses the same rescue-animal logic to argue for doing good on the Sabbath.
In Luke 6:27, Jesus commands love and doing good to enemies, paralleling the act of helping an enemy's donkey.
In Luke 14:5, Jesus argues for rescuing an animal on the Sabbath, mirroring the urgent aid commanded in Exodus.
In Romans 12:20, Paul quotes Proverbs 25:21 to reinforce the same ethic of feeding an enemy, directly echoing Exodus.
In Galatians 6:2, bearing one another's burdens echoes the command to help even an enemy's donkey—extending love to all.
In 1 Thessalonians 5:15, doing good to everyone parallels helping an enemy's donkey—both instruct proactive kindness to all.