1 Samuel 20:8, 13-17, 30-34, 42

Therefore deal kindly with thy servant; for thou hast brought thy servant into a covenant of Jehovah with thee: but if there be in me iniquity, slay me thyself; for why shouldest thou bring me to thy father?

Jehovah do so to Jonathan, and more also, should it please my father to do thee evil, if I disclose it not unto thee, and send thee away, that thou mayest go in peace: and Jehovah be with thee, as he hath been with my father. And thou shalt not only while yet I live show me the lovingkindness of Jehovah, that I die not; but also thou shalt not cut off thy kindness from my house for ever; no, not when Jehovah hath cut off the enemies of David every one from the face of the earth. So Jonathan made a covenant with the house of David, saying, And Jehovah will require it at the hand of David’s enemies. And Jonathan caused David to swear again, for the love that he had to him; for he loved him as he loved his own soul.

Then Saul’s anger was kindled against Jonathan, and he said unto him, Thou son of a perverse rebellious woman, do not I know that thou hast chosen the son of Jesse to thine own shame, and unto the shame of thy mother’s nakedness? For as long as the son of Jesse liveth upon the ground, thou shalt not be established, nor thy kingdom. Wherefore now send and fetch him unto me, for he shall surely die. And Jonathan answered Saul his father, and said unto him, Wherefore should he be put to death? what hath he done? And Saul cast his spear at him to smite him; whereby Jonathan knew that it was determined of his father to put David to death. So Jonathan arose from the table in fierce anger, and did eat no food the second day of the month; for he was grieved for David, because his father had done him shame.

And Jonathan said to David, Go in peace, forasmuch as we have sworn both of us in the name of Jehovah, saying, Jehovah shall be between me and thee, and between my seed and thy seed, for ever. And he arose and departed: and Jonathan went into the city.