1 Samuel 20:31

For while the son of Jesse is living on the earth, your position is unsafe and your kingdom is in danger. So make him come here to me, for it is certainly right for him to be put to death.

1 Samuel 19:6

And Saul gave ear to the voice of Jonathan, and said with an oath, By the living Lord, he is not to be put to death.

1 Samuel 19:11-15

Then in that night Saul sent men to David's house to keep watch on him so as to put him to death in the morning: and David's wife Michal said to him, If you do not go away to a safe place tonight you will be put to death in the morning.

1 Samuel 20:8

So, then, be kind to your servant; for you have been united with your servant in an agreement made before the Lord: but if there is any wrongdoing in me, put me to death yourself; why take me to your father?

1 Samuel 26:16

What you have done is not good. By the living Lord, death is the right fate for you, because you have not kept watch over your lord, the man on whom the Lord has put the holy oil. Now see, where is the king's spear, and the vessel of water which was by his head?

2 Samuel 19:28

For all my father's family were only dead men before my lord the king: and still you put your servant among those whose place is at the king's table. What right then have I to say anything more to the king?

Treasury of Scripture Knowledge

Summary

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.

General references

Bible References

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1 Samuel 20:8
So, then, be kind to your servant; for you have been united with your servant in an agreement made before the Lord: but if there is any wrongdoing in me, put me to death yourself; why take me to your father?
1 Samuel 19:6
And Saul gave ear to the voice of Jonathan, and said with an oath, By the living Lord, he is not to be put to death.

General references

1 Samuel 14:39
For, by the living Lord, the saviour of Israel, even if the sinner is Jonathan, my son, death will certainly be his fate. But not a man among all the people gave him any answer.

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain