1 Samuel 20:15

Show the same kind of loyalty to my family as long as you live. When Jehovah has completely destroyed all your enemies,

2 Samuel 21:7

David made a promise to Jonathan with Jehovah as his witness. He spared Jonathan's son Mephibosheth, the grandson of Saul.

1 Samuel 24:21

Promise me with Jehovah as your witness, that you will not destroy my descendants. Let them live to keep my family name alive.

2 Samuel 9:1-7

One day, David thought: I wonder if any of Saul's family is still alive. If they are I will be kind to them. This is because I made a promise to Jonathan.

Treasury of Scripture Knowledge

Summary

But also thou shalt not cut off thy kindness from my house for ever: no, not when the LORD hath cut off the enemies of David every one from the face of the earth.

General references

Bible References

Thou shalt

1 Samuel 24:21
Promise me with Jehovah as your witness, that you will not destroy my descendants. Let them live to keep my family name alive.
2 Samuel 9:1
One day, David thought: I wonder if any of Saul's family is still alive. If they are I will be kind to them. This is because I made a promise to Jonathan.
2 Samuel 21:7
David made a promise to Jonathan with Jehovah as his witness. He spared Jonathan's son Mephibosheth, the grandson of Saul.

General references

1 Samuel 23:18
They both promised Jehovah that they would always be loyal to each other. Then Jonathan went home while David stayed at Horesh.