Paul isn't just talking about earthly marriage. This illustration is a key to understanding a radical freedom available to believers.
A Powerful Analogy
This isn't just a casual observation about marriage; it's a direct analogy for our relationship with the law. Just as a wife is bound to her living husband, we were once bound to the law. The law had dominion over us, dictating its terms and holding us accountable.
Freedom Through Christ's Death
But Paul's argument, building on this, is that through Christ's death (which he explains more fully in the following verses), we have died to the law. We are like the widow who, upon her husband's death, is released. This release isn't a license to sin, but a freedom from the law's condemnation, allowing us to be united to Christ in a new, life-giving way.
A New Binding
This release from the law's dominion isn't into lawlessness. Instead, it's a transition to a new 'husband'—Christ. We are freed from the old, condemning relationship with the law to enter into a liberating, fruitful relationship with our resurrected Lord.