Shmuel Alef 20:2-4

Orthodox Jewish Bible

² And he said unto him, Chalilah (may it never be!); thou shalt not die: hinei, avi will do nothing either gadol or katon, but that he will reveal it to me; and why should avi hide this thing from me? It is not so.

³ And Dovid took an oath, moreover, and said, Avicha certainly knoweth that I have found chen in thine eyes; and he saith, Let not Yonatan know this, lest he be grieved; but truly as Hashem liveth, and as thy nefesh liveth, there is hardly a peysah (step) between me and mavet.

⁴ Then said Yonatan unto Dovid, Whatsoever thy nefesh saith, I will even do it for thee.