1 Samuel 19:1

And Saul spake to Jonathan his son, and to all his servants, that they should slay David. But Jonathan, Saul's son, delighted much in David.

1 Samuel 18:1

And it came to pass, when he had made an end of speaking unto Saul, that the soul of Jonathan was knit with the soul of David, and Jonathan loved him as his own soul.

1 Samuel 18:9

And Saul eyed David from that day and forward.

Treasury of Scripture Knowledge

Summary

And Saul spake to Jonathan his son, and to all his servants, that they should kill David.

Bible References

And saul

Ecclesiastes 9:3
This is an evil in all that is done under the sun, that there is one event unto all: yea also, the heart of the sons of men is full of evil, and madness is in their heart while they live, and after that they go to the dead.
Jeremiah 9:3
And they bend their tongue, as it were their bow, for falsehood; and they are grown strong in the land, but not for truth: for they proceed from evil to evil, and they know not me, saith Jehovah.
2 Timothy 3:13
But evil men and impostors shall wax worse and worse, deceiving and being deceived.

American Standard Version Public Domain