1 Samuel 18:8-10

Young's Literal Translation

⁸ And it is displeasing to Saul exceedingly, and this thing is evil in his eyes, and he saith, `They have given to David myriads, and to me they have given the thousands, and more to him [is] only the kingdom;'

⁹ and Saul is eyeing David from that day and thenceforth.

¹⁰ And it cometh to pass, on the morrow, that the spirit of sadness [from] God prospereth over Saul, and he prophesieth in the midst of the house, and David is playing with his hand, as day by day, and the javelin [is] in the hand of Saul,