The interactions between Abimelek and Abraham serve as a template for God's teaching on the respect and kindness God expects from his followers with respect to those on the outside-looking-in. Whether those in need are foreigners or outcasts in our own society, the followers of Jesus are called to imitate his compassionate outreach. For Abraham, this meant promising Abimelek that in the future when his descendants had the power to do so, they would treat Abimelek's descendants with kindness.
The modern Church has struggled, especially in the West, to fulfill this calling, we need to set aside our own political or cultural notions and instead truly embody the Fruit of the Spirit.