And the LORD said unto Samuel, How long wilt thou mourn for Saul, {a} seeing I have rejected him from reigning over Israel? fill thine horn with oil, and go, I will send thee to Jesse the Bethlehemite: for I have provided me a king among his sons.

(a) Signifying that we should not show ourselves more pitiful than God, nor to lament those whom he casts out.

Wesley's Notes

16:1 Mourn - And pray for his restitution, which the following words imply he did. Oil - Which was used in the inauguration of kings. But here it is used in the designation of a king; for David was not actually made king by it, but still remained a subject. And the reason of this anticipation was the comfort of Samuel, and other good men, against their fears in case of Saul's death, and the assurance of David's title, which otherwise would have been doubtful. I have provided - This phrase is very emphatical, and implies the difference between this and the former king. Saul was a king of the people's providing, he was the product of their sinful desires: but this is a king of my own providing, to fulfil all my will, and to serve my glory.

Jamieson-Fausset-Brown Bible Commentary

CHAPTER 16

1Sa 16:1-10. Samuel Sent by God to Bethlehem.

1. the Lord said unto Samuel, How long wilt thou mourn for Saul-Samuel's grief on account of Saul's rejection, accompanied, doubtless, by earnest prayers for his restitution, showed the amiable feelings of the man; but they were at variance with his public duty as a prophet. The declared purpose of God to transfer the kingdom of Israel into other hands than Saul's was not an angry menace, but a fixed and immutable decree; so that Samuel ought to have sooner submitted to the peremptory manifestation of the divine will. But to leave him no longer room to doubt of its being unalterable, he was sent on a private mission to anoint a successor to Saul (see on [244]1Sa 10:1). The immediate designation of a king was of the greatest importance for the interests of the nation in the event of Saul's death, which, to this time, was dreaded; it would establish David's title and comfort the minds of Samuel and other good men with a right settlement, whatever contingency might happen.

I have provided me a king-The language is remarkable, and intimates a difference between this and the former king. Saul was the people's choice, the fruit of their wayward and sinful desires for their own honor and aggrandizement. The next was to be a king who would consult the divine glory, and selected from that tribe to which the pre-eminence had been early promised (Ge 49:10).

Matthew Henry's Concise Commentary

16:1-5 It appears that Saul was grown very wicked. Of what would he not be guilty, who durst think to kill Samuel? The elders of Bethlehem trembled at Samuel's coming. It becomes us to stand in awe of God's messengers, and to tremble at his word. His answer was, I come peaceably, for I come to sacrifice. When our Lord Jesus came into the world, though men had reason to fear that his errand was to condemn the world, yet he gave full assurance that he came peaceably, for he came to sacrifice, and he brought his offering with him; A body hast thou prepared me. Let us sanctify ourselves, and depend upon His sacrifice.