What does the Bible say about Abraham's covenant blessings?

In Genesis 25, we see that circumstances do not dictate God's covenant blessings. Despite the death of Sarah and Abraham taking another wife, Keturah, all blessings and inheritance were given to Isaac alone. This highlights the nature of God's sovereign choice and fulfillment of His promises through Isaac, illustrating that the covenant blessings rest solely in God's purpose rather than the changing circumstances of life. As the Apostle Paul explains in Galatians 3:16, the promise was made to Abraham's singular 'seed,' which ultimately points to Christ and the salvation found in Him.