1 Samuel 16:14

Overview - 1 Samuel 16
Samuel sent by God, under pretence of a sacrifice, comes to Beth-lehem.
His human judgment is reproved.
11 He anoints David.
15 Saul sends for David to quiet his evil spirit.
Treasury of Scripture Knowledge

1 Samuel 16:14  (King James Version)
But the Spirit of the LORD departed from Saul, and an evil spirit from the LORD troubled him.

the Spirit
11:6 18:12 28:15 Judges 16:29 ; Psalms 51:11 ; Hosea 9:12

evil spirit
The evil spirit was either sent immediately from the Lord, or permitted to come; but whether this was a diabolic possession, or a mere mental malady, is not agreed: it seems to have partaken of both. That Saul had fallen into a deep melancholy, there is little doubt; and that an evil spirit might work more effectually on such a state of mind, there can be little question. His malady appears to have been of a mixed kind, natural and diabolical: there is too much of apparent nature in it to permit us to believe it was all spiritual; and there is too much of apparently supernatural influence, to suffer us to believe it was all natural.
18:10 1 Samuel 19:9 1 Samuel 19:10 Judges 9:23 ; 1 Kings 22:22 ; Acts 19:15 Acts 19:16

or, terrified.