It is not clear exactly what the peace represents. Possibly it relates to David leaving Saul’s service. The continual hatred of Saul coupled with permission from Jonathan being the Lord’s confirmation to David that he was free to go.1 Alternatively it indicates the relations between Jonathan and David. They had peace with one another.2 Even though they were part of two opposing camps, they did not consider each other enemy but friend. They would meet again briefly once more in the wilderness of Zip (1 Samuel 23:16–18).3
42 Then Jonathan said to David, “Go in peace, because we have sworn both of us in the name of the LORD, saying, ‘The LORD shall be between me and you, and between my offspring and your offspring, forever.’” And he rose and departed, and Jonathan went into the city.