In the 16th chapter of Samuel, it is said, that an evil spirit of God troubled Saul, and that his servants advised him (as a remedy) "to seek out a man who was a cunning player upon the harp." And Saul said, [verse 17,] Provide me now a man that can play well, and bring him to me. Then answered one of the servants, and said, Behold I have seen a son of Jesse the Bethlehemite, that is cunning in playing, and a mighty valiant man, and a man of war, and prudent in matters, and a comely person, and the LORD is with him. Wherefore Saul sent messengers unto Jesse, and said, "Send me David thy son." And [verse 21,] David came to Saul, and stood before him, and he loved him greatly, and he became his armor-bearer. And when the evil spirit from God was upon Saul [ver. 23] that David took an harp, and played with his hand: so Saul was refreshed, and was well."
But the next chapter  gives an account, all different to this, of the manner that Saul and David became acquainted. Here it is ascribed to David's encounter with Goliah, when David was sent by his father to carry provision to his brethren in the camp. In the 55th verse of this chapter it is said, "And when Saul saw David go forth against the Philistine [Goliah], he said unto Abner, the captain of the host, Abner, whose son is this youth? And Abner said, As thy soul liveth, O king, I cannot tell. And the king said, Enquire thou whose son the stripling is. And as David returned from the slaughter of the Philistine, Abner took him, and brought him before Saul with the head of the Philistine in his hand. And Saul said to him, Whose son art thou young man? And David answered, I am the son of thy servant Jesse the Bethlehemite." These two accounts belie each other, because each of them supposes Saul and David not to have known each other before. This book, the Bible is too ridiculous even for criticism.