Is this psalm about Creation, or about the end of days?
The classic sources give two answers. The Gemara says the Levites sang this psalm on Friday because on the sixth day God finished His work and reigned over it. That points backward, to Creation.
But the commentators on the psalm itself often read it as pointing forward. Rashi (the main commentator on the Torah and Gemara, France, died 1105) says on the first words: they will say it in the future. Radak (Rabbi David Kimchi, Provence, died 1235) says this psalm and the ones after it are about the days of the Mashiach, when everyone will see that God rules over all and people will no longer act proud before Him, the way King Nebuchadnezzar did. Metzudat David (a commentary from the 1700s) says the same: in those days people will say, "Hashem has become King."
The Meiri (Rabbi Menachem Meiri, Provence, around 1300) gives both. To him the psalm seems to hint at the creation of the world, especially when the waters gathered into one place. Then he adds that some explain the whole psalm as about the days of the Mashiach, and that the verb malach ("has become King") is in the past tense where the future is meant.
How can one psalm be both? The sources do not say it in so many words. One way to read them is that they answer two different questions. The Gemara asks why the Levites picked this psalm for Friday. Rashi, Radak and Metzudat David ask what the psalm itself describes.
The Gemara has a similar argument about Shabbat's psalm. The Mishnah says Shabbat's psalm is a song for the time to come, a day that will be all Shabbat. In the Gemara, Rabbi Nechemya asks what reason there is to treat Shabbat differently, and says all the psalms look back to Creation. Either way, Friday's reason stays the same.
Rosh Hashanah 31a,Mishnah Tamid 7:4,Rashi, Radak, Metzudat David and Meiri on Tehillim 93:1Are the roaring rivers real rivers, or something else?
The middle of the psalm is about noisy water. "The rivers have lifted up their voice. The rivers lift up their pounding." Then it says God is mightier than the roar of the waters. The sources do not agree on what the water stands for.
Ibn Ezra takes it as real water. After mentioning the earth and the heavens, he says, the psalm mentions the seas and rivers that never stop moving. They rise only because God wills it, through the winds He sends.
Rashi hears something else. For him the rivers are the nations, flooding in and raising their voices against God. He reads the verse as a cry of complaint, "Woe, Hashem, look at the nations pouring over us," and the next verse as the answer: more than those waters, God is mighty. Radak also calls it a parable, about Gog and Magog (the nations that, in the prophets' vision, gather to fight Jerusalem at the end of days).
Midrash Tehillim offers more than one reading. Resh Lakish (a rabbi of the Gemara) says "rivers" means the Philistines, because a verse in Melachim speaks of the land "from the River to the land of the Philistines." When they captured the Ark, he says, they boasted that they had captured not only the Ark but the Master of the Ark. Another reading goes back to Creation, when the waters tried to cover the earth again.
Malbim (Rabbi Meir Leibush, a Bible commentator of the 1800s) turns the rivers into witnesses, not enemies. In his reading the rivers and seas themselves speak. They say God's throne is firm and that He is mighty on high, because the sea stays inside the borders He set for it.
So the same noise is a threat in one reading and a testimony in another. In Ibn Ezra, Rashi and Radak, the next verse gives the answer: however loud the water is, God is mightier. In Malbim, the water itself is the one saying that God is mighty on high.
Tehillim 93:3-4,Ibn Ezra, Rashi, Radak and Malbim on Tehillim 93:3-4,Midrash Tehillim 93:2-3Why does a psalm about God's power end with a building?
The last verse changes the scale. After thunder and floods it says: "Your testimonies are extremely reliable. Holiness suits Your house, Hashem, for length of days." The "house" is the Temple. So what does a building have to do with ocean waves?
Malbim says that is the point. The waves show that God is mighty on high, which could suggest a ruler far away. But the testimony God gave us, he says, is that He is not far off. He is present in the Temple, with a care that goes beyond nature. That care is steady, "for length of days," and not only a miracle now and then.
Rashi reads "testimonies" as the promises the prophets made about the Temple. Even though it has taken a long time, he says, those promises are still extremely faithful. Radak reads them as the prophets' words about God's rule, which will then come true, and says the verse looks to a Temple that will be beautiful for length of days, so that it will never be destroyed again.
Midrash Tehillim hears a request in the verse. Moshe tells God that He lowered the voice of the Torah and of His house and raised the voice of the wicked, and asks Him to raise the voice of the Torah and His house. The Midrash adds that King Shlomo built the Temple and it was destroyed, Ezra built it and it was destroyed, but this time it will be "for length of days."
Ibn Ezra makes a comparison. Heaven, earth and sea all testify to God, he says, but God's own testimonies are more trustworthy than all of them. That is why the verse adds "extremely."
The commentators differ on whether the verse is a promise, a plea or a comparison. They agree it is about the Temple.
Tehillim 93:5,Malbim, Rashi, Radak and Ibn Ezra on Tehillim 93:5,Midrash Tehillim 93:6