1 Samuel (Author Compiled by Isaiah from records of Samuel, David, Nathan, and Gad.)
18:10And it came to pass the next day that an evil spirit from God came upon Saul, and he prophesied in the midst of the house, but David played with his hand, as on other days; and the spear was in Saul's hand.
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.