Shmuel Alef 18:3

3 Then Yonatan and Dovid made a brit (covenant), because he loved him as his own nefesh.

Shmuel Alef 18:3 Meaning and Commentary

1 Samuel 18:3

Then Jonathan and David made a covenant
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.

Shmuel Alef 18:3 In-Context

1 8 And it came to pass, when he had made an end of speaking unto Sha’ul, that the nefesh Yonatan was kashur (tied together) with the nefesh Dovid, and Yonatan loved him as his own nefesh.
2 And Sha’ul drafted him that day, and would let him return no more to the bais aviv.
3 Then Yonatan and Dovid made a brit (covenant), because he loved him as his own nefesh.
4 And Yonatan stripped himself of the me’il (robe) that was upon him, and gave it to Dovid, and his middah [war garments], even to his cherev, and to his keshet, and to his khagor (belt).
5 And Dovid went out whithersoever Sha’ul sent him, and prospered; and Sha’ul set him over the anshei hamilchamah, and he was accepted in the sight of kol HaAm, and also in the sight of the avdei Sha’ul.