Numbers 24:7

From his buckets. From his wells. The explanation is as Targum [Onkelos] interprets.

And his seed will have an abundant flow. This denotes success, like a seed planted near water.

His king will be greater than Agag. Their first king shall conquer Agag, king of Amalek.

And his monarchy shall be uplifted. Yaakov’s [monarchy] more and more, as he (Shaul) shall be followed by Dovid and Shlomo.

From them their King shall arise, and their Redeemer be of them and among them, and the seed of the children of Jakob shall rule over many nations. The first who will reign over them will make war with the house of Amalek, and will be exalted above Agag their king; but because he had spared him his kingdom will be taken from him.

AND HIS KING SHALL BE HIGHER THAN AGAG. “Their first king [Saul] will conquer Agag king of the Amalekites. Agag is here called by his name before he was born. Similar cases are [the expressions]: to Cyrus, whose right hand I have holden; Behold, a son shall be born unto the house of David, Josiah by name. So also were the names of Isaac, Ishmael,, 16:11. and Solomon [given before they were born]. AND HIS KINGDOM — that is, Jacob’s — SHALL BE EXALTED more and more, because David and his son Solomon will come after him [Saul].” This is Rashi’s language, and he has explained it well.
It is possible that every king of the Amalekite people was called Agag, because the first king whom they set up over them was so called [Agag], and thus all his descendants who occupied his throne were called by his name, as are most kings even nowadays, who are called by the name of those who [originally] seized the kingdom. So also Haman the Agagite [was so called] because he was a descendant of that royal family. For it is unlikely that the prophet [Balaam] would cite the name of a wicked man [Agag] even before he was formed in the womb. So also [the name] Gog was one by which all the princes of Magog were called.
Thus Balaam added with this third prophecy of his [to his previous two prophecies] by telling Balak that Jacob’s tents are goodly, referring to the period from the time that they were dwellers in tents until they would inherit the land [of Canaan], and the dwellings of Israel after the conquest and division of the Land will also be good, meaning that they will dwell therein in safe habitations. And [Balaam further informed Balak that] Israel’s land will be full of all goodly things, like a watered garden, and like a spring of water, whose waters fail not, and that Israel will conquer Amalek because he attacked him, and will destroy his memory; and that the kingdom of Israel will be even more exalted, because they will have afterwards mighty kings, who will be exceedingly elevated. And he further told him that Israel would eat up his adversaries and break their bones in pieces, referring to their wealth and all their belongings. And [finally, in Verse 9] he told him that Israel would dwell in the Land safely, fearing no people, as a lion, and as a lioness that does not fear any ravenous beast. And so now Balak despaired of [ever fighting] Israel, for [he realized that] if he would fight against him, he would be truly destroyed, for Israel would eat up all his adversaries in the same way that he would destroy Amalek because he attacked him. Therefore Balak now told Balaam to flee to his place, for he has no more desire for him [and his counsel].

וירום מאגג מלכו, a reference to King Sha-ul. Every ruler of the people of Amalek was always called Agag, just as Egyptian rulers were called Pharaoh, and just as the rulers of the Philistines were always known as Avimelech. Kings of Jerusalem in those days always had a title incorporating the word צדק, such as Malki Tzedek, and Adoni Tzedek.

יזל מים מדליו, “water shall drip in a stream from its boughs;” the root נזל is used by Bileam in the same sense as by Devorah in her victory hymn to the Lord, Judges 5,5: הרים נזלו, “mountains quaked;” just as at the revelation on Mount Sinai. The power of rushing waters we call tzunami nowadays, are described by the prophet in Isaiah 8,7 as the turbulent flood waters of the rivers Euphrates and Tigris in Assyria.

וירום מאגג מלכו, “and its king will rise above that of Agag. Bileam foresees the first king of the Israelites, King Sha-ul, as defeating the Kingdom of Amalek headed by Agag at the time (Samuel I chapter 15). All the Kings of the Amalekites bore the title “Agag,” just as all the Kings of Egypt bore the title “Pharaoh.” All the kings of the Philistines bore the title “Avimelech.”

ותנשא מלכותו, “their Kingdom shall be exalted;” the kingdom of the Israelites.