The Jerahmeelites - i. e. the descendants of Jerahmeel, the son of Hezron, the son of Perez, the son of Judah (marginal references). They were therefore a portion of the "south of Judah."

The Kenites - See Numbers 24:21 note; Numbers 4:11; and for their near neighborhood to Amalek, see 1 Samuel 15:6.

Whither have ye made a road today? - He had probably been in the habit of making predatory excursions. This seems to be implied in the question of Achish.

And Achish said, whither have ye made a road today?.... Or whither had they rushed in, or poured in and spread themselves? or where had they made their excursion to fetch in the prey and booty they now brought?

and David said, against the south of Judah; he meant against some people that lay to the south of the land of Judah, without it; but expressed himself so, that Achish might think he meant the southern parts of Judah within the country; which, though not a downright lie, was an equivocation, and made with a design to deceive; and was by no means agreeably to the character of David, nor to be defended nor imitated:

and against the south of the Jerahmeelites; these were the descendants of Jerahmeel, the son of Hezron, the grandson of Judah, and so inhabited in the tribe of Judah, and very probably in the southern part of it, 1 Chronicles 2:9,

and against the south of the Kenites; the posterity of Jethro; these, at least some of them, at the first seating of the children of Israel in the land of Canaan, went with the children of Judah into the wilderness of Judah, which lieth in the south of Arad, Judges 1:16.

Achish said, "Ye have not made an invasion to-day, have ye?" אל, like μὴ, is an interrogative sense; the ה has dropped out: vid., Ewald, 324, b. David replied, "Against the south of Judah, and the south of the Jerahmeelites, and into the south of the Kenites," sc., we have made an incursion. This reply shows that the Geshurites, Gerzites, and Amalekites dwelt close to the southern boundary of Judah, so that David was able to represent the march against these tribes to Achish as a march against the south of Judah, to make him believe that he had been making an attack upon the southern territory of Judah and its dependencies. The Negeb of Judah is the land between the mountains of Judah and the desert of Arabia (see at Joshua 15:21). The Jerahmeelites are the descendants of Jerahmeel, the first-born of Hezron (1 Chronicles 2:9, 1 Chronicles 2:25-26), and therefore one of the three large families of Judah who sprang from Hezron. They probably dwelt on the southern frontier of the tribe of Judah (vid., 1 Samuel 30:29). The Kenites were protgs of Judah (see at 1 Samuel 15:6, and Judges 1:16). In 1 Samuel 27:11 the writer introduces the remark, that in his raid David left neither man nor woman of his enemies alive, to take them to Gath, because he thought "they might report against us, and say, Thus hath David done." There ought to be a major point under דּוד עשׂה, as the following clause does not contain the words of the slaughtered enemies, but is a clause appended by the historian himself, to the effect that David continued to act in that manner as long as he dwelt in the land of the Philistines. משׁפּט, the mode of procedure; lit. the right which he exercised (see 1 Samuel 8:9).

And Achish said, Whither have ye made a road to day? And David said, Against the south of Judah, and against the south of the {e} Jerahmeelites, and against the south of the Kenites.

(e) A family of the tribe of Judah, 1Ch 2:9.

27:10 David - These and the following words are ambiguous, and contrary to that simplicity which became David, both as a prince, and as an eminent professor of the true religion. The fidelity of Achish to him, and the confidence he put in him, aggravates his sin in thus deceiving him, which David seems penitently to reflect on, when he prays, Remove from me the way of lying.

Whither...: or, Did you not make a road, etc

10. Achish said, Whither have ye made a road to-day?-that is, raid, a hostile excursion for seizing cattle and other booty.

David said, Against the south of Judah, and against the south of the Jerahmeelites-Jerahmeel was the great-grandson of Judah, and his posterity occupied the southern portion of that tribal domain.

the south of the Kenites-the posterity of Jethro, who occupied the south of Judah (Jud 1:16; Nu 24:21). The deceit practised upon his royal host and the indiscriminate slaughter committed, lest any one should escape to tell the tale, exhibit an unfavorable view of this part of David's history.

27:8-12 While David was in the land of the Philistines, he attacked some remains of the devoted nations. The people whom he cut off were long before doomed to destruction. It is often wisdom to shun public notice, but we must in no situation be idle. We must always try to do somewhat in the cause of God. This expedition David hid from Achish. But an equivocation which serves the purpose of a lie, is as like to it as a hypocrite is to a profane person, it is only better in appearance, therefore more dangerous. Yet, though believers often manifest imperfections, they can never be prevailed upon to renounce the service of God, and to unite interests with his enemies, or finally to become the servants of sin and Satan. But what a train of evils follow from unbelief! When we forget the Lord's past mercies, and his gracious assurances, we shall be overwhelmed with desponding fears, and probably be led to adopt some dishonourable method to get rid of our troubles. Nothing can so effectually establish us in holy tempers and practices, and preserve us from perplexities, as firm, unshaken dependence upon the promises of God in Christ Jesus.