Matthew Henry on 1 Samuel 18:1-5
David was anointed to the crown to take it out of Saul's hand, and over Jonathan's head, and yet here we find,
I. That Saul, who was now in possession of the crown, reposed a confidence in him, God so ordering it, that he might by his preferment at court be prepared for future service. Saul now took David home with him, and would not suffer him to return again to his retirement, Sa1 18:2. And David having signalized himself above the men of war, in taking up the challenge which they declined, Saul set him over the men of war (Sa1 18:5), not that he made him general (Abner was in that post), but perhaps captain of the life-guard; or, though he was youngest, he ordered him to have the preceden…
Read the whole note in the consoleJamieson-Fausset-Brown on 1 Samuel 18:2
Saul would let him go no more home--He was established as a permanent resident at court.
Adam Clarke on 1 Samuel 18:1
When he had made an end of speaking - These first five verses are omitted by the Septuagint. See the notes on the preceding chapter, 1 Samuel 17 (note).
Jonathan loved him as his own soul - The most intimate friendship subsisted between them; and they loved each other with pure hearts fervently. No love was lost between them; each was worthy of the other. They had a friendship which could not be affected with changes or chances, and which exemplified all that the ancients have said on the subject; Την φιλιαν ισοτητα ειναι, και μιαν ψυχην, τον φιλον ἑτερον αυτον; "Friendship produces an entire sameness; it is one soul in two bodies: a friend is another self."
John Gill on 1 Samuel 18:2
And Saul took him that day,.... Not only into his favour, and into his service, but into his court; even on that very day he slew the Philistine, or however as soon as it could be done:
and would let him go no more home to his father's house; as he used to do before; when he only served as a musician to him, then he was only at court when Saul was in a melancholy disposition, and wanted him, and so was going and returning, and in the intervals kept his father's sheep, 1 Samuel 17:15; but now he would not suffer him to attend such business any longer, since he was not only to become a courtier, and be made a prince or noble, but to marry his daughter, according to the declaration he had made…