1Sa 16:1
16:1 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.

1Sa 16:2
16:2 And Samuel said, How can I go? if Saul hear [it], he will
     kill me.  And the LORD said, Take an heifer with thee, and
     say, I am come {b} to sacrifice to the LORD.

     (b) That is, to make a peace offering, which may be done
         even though the ark was not there.

1Sa 16:4
16:4 And Samuel did that which the LORD spake, and came to
     Bethlehem.  And the elders of the town {c} trembled at his
     coming, and said, Comest thou peaceably?

     (c) Afraid, lest some grievous crime had been committed,
         because the prophet was not wont to come there.

1Sa 16:6
16:6 And it came to pass, when they were come, that he looked on
     Eliab, and said, Surely the LORD'S {d} anointed [is] before
     him.

     (d) Thinking that Eliab had been appointed by God to be
         made king.

1Sa 16:14
16:14 But the Spirit of the LORD departed from Saul, and an {e}
      evil spirit from the LORD troubled him.

      (e) The wicked spirits are at God's commandment to execute
          his will against the wicked.

1Sa 16:18
16:18 Then answered one of the servants, and said, Behold, I
      have seen a {f} 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.

      (f) Though David was now anointed king by the prophet,
          yet God would strengthen and test him in various ways
          before he had the use of his kingdom.

1Sa 16:23
16:23 And it came to pass, when the [evil] spirit from God was
      upon Saul, that David took an harp, and played with his
      hand: so Saul was {g} refreshed, and was well, and the
      evil spirit departed from him.

      (g) God would have Saul receive this benefit from David's
          hand, that his condemnation might be even more
          evident, for his cruel hate toward him.