42 Then Jonathan said to David, "Go in peace, since we have both sworn in the name of the Lord, saying, 'May the Lord be between you and me, and between your descendants and my descendants, forever.' " So he arose and departed, and Jonathan went into the city.
Matthew Henry's Commentary on 1 Samuel 20:42
Commentary on 1 Samuel 20:35-42
(Read 1 Samuel 20:35-42)
The separation of two such faithful friends was grievous to both, but David's case was the more deplorable, for David was leaving all his comforts, even those of God's sanctuary. Christians need not sorrow, as men without hope; but being one with Christ, they are one with each other, and will meet in his presence ere long, to part no more; to meet where all tears shall be wiped from their eyes.