'Worry' in the Bible

When they entered the land of Zuph, Saul said to his servant who [was] with him, "Come, let us return, lest my father cease [caring about] the female donkeys and worry about us!"

Then David {took an oath} again and said, "Your father knows very well that I have found favor in your eyes, and he thought, 'Do not let Jonathan know this, lest he worry.' But {as Yahweh lives} and {as your soul lives}, surely [there is] merely a step between me and death!"