1 Samuel 20:4

2 And he said unto him, God forbid; thou shalt not die: behold, my father will do nothing either great or small, but that he will shew it me: and why should my father hide this thing from me? it is not so.

3 And David sware moreover, and said, Thy father certainly knoweth that I have found grace in thine eyes; and he saith, Let not Jonathan know this, lest he be grieved: but truly as the LORD liveth, and as thy soul liveth, there is but a step between me and death.

Then said Jonathan unto David, Whatsoever thy soul desireth, I will even do it for thee.

5 And David said unto Jonathan, Behold, to morrow is the new moon, and I should not fail to sit with the king at meat: but let me go, that I may hide myself in the field unto the third day at even.

6 If thy father at all miss me, then say, David earnestly asked leave of me that he might run to Beth-lehem his city: for there is a yearly sacrifice there for all the family.

Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB
Then Jonathan said to David, “Whatever you desire, I will do for you.”
KJV
Then said Jonathan unto David, Whatsoever thy soul desireth, I will even do it for thee.
WEB
Then Jonathan said to David, “Whatever your soul desires, I will even do it for you.”
ASV
Then said Jonathan unto David, Whatsoever thy soul desireth, I will even do it for thee.
DARBY
And Jonathan said to David, What thy soul may say, I will even do it for thee.
BLB
And Jonathan said to David, “What your soul says, I will do for you.”
ÅB
Da sa Jonatan til David: Alt hva du ønsker, vil jeg gjøre for deg.
OTB
Da forsikret Jonatan David: "Jeg vil gjøre hva du enn ber om."
B1930
Da sa Jonatan til David: Alt hvad du ønsker, vil jeg gjøre for dig.

Study notes (Tyndale)

Original text and word study