New Revised Standard Version
But David also swore, “Your father knows well that you like me; and he thinks, ‘Do not let Jonathan know this, or he will be grieved.’ But truly, as the LORD lives and as you yourself live, there is but a step between me and death.”

Contemporary English Version
"Jonathan, I swear it's true! But your father knows how much you like me, and he didn't want to break your heart. That's why he didn't tell you. I swear by the living LORD and by your own life that I'm only one step ahead of death."

New American Bible
But David replied: “Your father is well aware that I am favored with your friendship, so he has decided, ‘Jonathan must not know about this or he will be grieved.’ Nevertheless, as the LORD lives and as you live, there is only a step between me and death.”

Douay-Rheims Bible
And he swore again to David. And David said: Thy father certainly knoweth that I have found grace in thy sight, and he will say: Let not Jonathan know this, lest he be grieved. But truly as the Lord liveth, and thy soul liveth, there is but one step (as I may say) between me and death.

And he swore again to David. And David said: Thy father certainly knoweth that I have found grace in thy sight, and he will say: Let not Jonathan know this, lest he be grieved. But truly as the Lord liveth, and thy soul liveth, there is but one step (as I may say) between me and death.

sware

Deuteronomy 6:13 Take heed diligently lest thou forget the Lord, who brought thee out of the land of Egypt, out of the house of bondage. Thou shalt fear the Lord thy God, and shalt serve him only, and thou shalt swear by his name.

Jeremiah 4:2 And thou shalt swear: As the Lord liveth, in truth, and in judgment, and in justice: and the Gentiles shall bless him, and shall praise him.

Hebrews 6:16 For men swear by one greater than themselves: and an oath for confirmation is the end of all their controversy.

but truly

1 Samuel 25:26 Now therefore, my lord, the Lord liveth, and thy soul liveth, who hath withholden thee from coming to blood, and hath saved thy hand to thee: and now let thy enemies be as Nabal, and all they that seek evil to my lord.

1 Samuel 27:1 And David said in his heart: I shall one day or other fall into the hands of Saul: is it not better for me to flee, and to be saved in the land of the Philistines, that Saul may despair of me, and cease to seek me in all the coasts of Israel? I will flee then out of his hands.

2 Samuel 15:21 And Ethai answered the king, saying: As the Lord liveth, and as my lord the king liveth: in what place soever thou shalt be, my lord, O king, either in death, or in life, there will thy servant be.

2 Kings 2:2,4,6 And Elias said to Eliseus: Stay thou here, because the Lord hath sent me as far as Bethel. And Eliseus said to him: As the Lord liveth, and as thy soul liveth, I will not leave thee. And when they were come down to Bethel, . . .

as thy soul

1 Samuel 1:26 And Anna said: I beseech thee, my lord, as thy soul liveth, my lord: I am that woman, who stood before thee here praying to the Lord.

1 Samuel 17:55 Now at the time that Saul saw David going out against the Philistines, he said to Abner, the captain of the army: Of what family is this young man descended, Abner? And Abner said: As thy soul liveth, O king, I know not.

Jeremiah 38:16 Then king Sedecias swore to Jeremiah, in private, saying: As the Lord liveth, that, made us this soul, I will not put thee to death, nor will I deliver thee into the hands of these men that seek thy life.

but a step

1 Samuel 27:1 And David said in his heart: I shall one day or other fall into the hands of Saul: is it not better for me to flee, and to be saved in the land of the Philistines, that Saul may despair of me, and cease to seek me in all the coasts of Israel? I will flee then out of his hands.

Deuteronomy 28:66 And thy life shall be as it were hanging before thee. Thou shalt fear night and day, neither shalt thou trust thy life.

Psalm 116:3 The sorrows of death have compassed me: and the perils of hell have found me. I met with trouble and sorrow:

1 Corinthians 15:30,31 Why also are we in danger every hour? . . .

2 Corinthians 1:9,10 But we had in ourselves the answer of death, that we should not trust in ourselves, but in God who raiseth the dead. . . .