Psalms 2

This Psalm is speaking mainly about the coming Messiah descendant of David who will eventually rule over the entire world. The heathen non-Israelite nations will be reluctant to accept the authority of the Messiah and therefore will be dealt with.  That is according to our understanding.  Some Commentators (Radak, Iben Ezra) say it refers to David at the time he became king and the Philistines decided to attack him.

[Psalms 2:1] WHY DO THE HEATHEN RAGE, AND THE PEOPLE IMAGINE A VAIN THING?
[Psalms 2:2] THE KINGS OF THE EARTH SET THEMSELVES, AND THE RULERS TAKE COUNSEL TOGETHER, AGAINST THE LORD, AND AGAINST HIS ANOINTED, SAYING,

Those who set themselves against the people of God (Israel and Judah) or against the anointed of God are considered as setting themselves against God Himself.

[Psalms 2:3] LET US BREAK THEIR BANDS ASUNDER, AND CAST AWAY THEIR CORDS FROM US.

Israel under the messiah shall gain dominion over the nations but they shall attempt to rebel.

[Psalms 2:4] HE THAT SITTETH IN THE HEAVENS SHALL LAUGH: THE LORD SHALL HAVE THEM IN DERISION.
[Psalms 2:5] THEN SHALL HE SPEAK UNTO THEM IN HIS WRATH, AND VEX THEM IN HIS SORE DISPLEASURE.
[Psalms 2:6] YET HAVE I SET MY KING UPON MY HOLY HILL OF ZION.

"Zion" is in  Jerusalem just north of the Jewish Quarter. Zion in the Bible is synonymous with Jerusalem and with Judah though in some contexts it can refer to Joseph (Midrash Tanchuma).

[Psalms 2:7] I WILL DECLARE THE DECREE: THE LORD HATH SAID UNTO ME, THOU ART MY SON;   THIS DAY HAVE I BEGOTTEN THEE.

On the day that the Messiah is appointed it is as if he becomes the son of the Almighty and the Divine Spirit enters him. The Radak applies this verse to David:

"THEN SAMUEL TOOK THE HORN OF OIL, AND ANOINTED HIM IN THE MIDST OF HIS BRETHREN: AND THE SPIRIT OF THE LORD CAME UPON DAVID FROM THAT DAY FORWARD"   [1-Samuel 16:13]
[Psalms 2:8] ASK OF ME, AND I SHALL GIVE THEE THE HEATHEN FOR THINE INHERITANCE, AND THE UTTERMOST PARTS OF THE EARTH FOR THY POSSESSION.
[Psalms 2:9] THOU SHALT BREAK THEM WITH A ROD OF IRON; THOU SHALT DASH THEM IN PIECES LIKE  A POTTER'S VESSEL.
[Psalms 2:10] BE WISE NOW THEREFORE, O YE KINGS: BE INSTRUCTED, YE JUDGES OF THE EARTH.
[Psalms 2:11] SERVE THE LORD WITH FEAR, AND REJOICE WITH TREMBLING.
[Psalms 2:12] KISS THE SON, LEST HE BE ANGRY, AND YE PERISH FROM THE WAY, WHEN HIS  WRATH IS KINDLED BUT A LITTLE. BLESSED ARE ALL THEY THAT PUT THEIR TRUST IN HIM.

<<KISS THE SON>>: Hebrew, "Nashku Bar". "Nashku" means "kiss" (plural) or cling to or join with. Rashi quotes a source that derives the word from the same root as "Teshuka" meaning "desire "bar" in Aramaic means "son" but in Hebrew it means grain (from which we have the English word "barley") or "righteousness, purity".
Cf. HE THAT HATH CLEAN HANDS, AND A PURE [Hebrew: "bar"] HEART [Psalms 24:4] "Nashku Bar" could therefore mean "cleave to righteousness" or "desire purity". << LEST HE BE ANGRY>>: i.e. lest God be angry. God rewards us and punishes us according to our deeds.
The Malbim seems to suggest that "BAR" can also mean "chosen one" from the root "Barar". It could therefore be rendered, "Join the  Chosen One (Messiah), Lest He (God) be angry". There is (as the Malbim mentions) one source where "bar" may mean "son": <<WHAT, MY SON [Hebrew: beri]? AND WHAT, THE SON ["bar"] OF MY WOMB? AND WHAT, THE SON OF MY VOWS? [Proverbs 31:2].  Here too "bar" may actually mean something else (like "chosen") or it may actually mean "son" since it does mean "son" in Aramaic. Very often the wood roots of Aramaic and Hebrew interchange and they are related languages. Therefore it could mean, "Cleave to the son" [the Messiah  who on the day of his anointment becomes "borne" of God] so that that Almighty will not be angry with you. Israel is also considered a son of the Almighty and so is Ephraim: << I AM A FATHER TO ISRAEL, AND EPHRAIM IS MY FIRSTBORN>> [Jeremiah 31:9].

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