SEV Biblia, Chapter 18:3
E hicieron alianza Jonatán y David, porque él le amaba como a su propia alma.
John Gill's Bible Commentary
Ver. 3. Then Jonathan and David made a covenant , etc.] A covenant of friendship; entered into a solemn agreement to keep up and maintain a cordial respect to each other, and to support each other’s interest both in life and after death, whoever was the survivor; and in consequence of this David had a friend at court, when Saul fell out with him, and who pleaded his cause, and discovered his father’s plots, and was the means of preserving David’s life: because he loved him as his own soul ; so that this covenant was not founded in mere words, but in sincere and cordial affection, and was lasting and inviolable.
Matthew Henry Commentary
Verses 1-5 - The friendship of David and Jonathan was the effect of Divine grace which produces in true believers one heart and one soul, and cause them to love each other. This union of souls is from partaking in the Spirit of Christ. Where God unites hearts, carnal matters are too wea to separate them. Those who love Christ as their own souls, will be willing to join themselves to him in an everlasting covenant. It wa certainly a great proof of the power of God's grace in David, that he was able to bear all this respect and honour, without being lifted u above measure.
Original Hebrew
ויכרת 3772 יהונתן 3083 ודוד 1732 ברית 1285 באהבתו 160 אתו 853 כנפשׁו׃ 5315