Fifteen words that all mean praise. Why fifteen?
Count the words in the middle of Yishtabach, from shir to hoda'ot: song, praise, praise, music, strength, rule, victory, greatness, might, praise, glory, holiness, kingship, blessings, thanks. Fifteen. The Vayevarech David prayer already told where the Tur says they come from. Here the question is the number.
Abudarham (Rabbi David Abudarham of Seville, about 1340) gives an answer. The fifteen match the fifteen Songs of Ascents that David said, Tehillim 120 to 134. They also match the fifteen ma'alot, "steps," set out in the Haggadah.
The Mishnah (the core text of the Oral Torah) ties the Songs of Ascents to the Temple. There, fifteen steps led up from the Women's Courtyard to the Courtyard of Israel, matching the fifteen Songs of Ascents. The Levites stood on those steps and sang.
The Haggadah uses the same word. "How many good steps (ma'alot) God has done for us," it says, and then lists them one by one in Dayenu: out of Egypt, the sea, the manna, Shabbat, Sinai, the Torah, the Land, and last, the Temple. Fifteen in all.
What the three share is the word ma'alot, steps: going up one at a time.
Abudarham does not say the author planned the number. He shows what it matches.
Abudarham, Songs of Praise,Mishnah Middot 2:5,Pesach Haggadah, DayenuWhy is talking after Yishtabach compared to running away from a war?
The Shulchan Aruch (the main code of Jewish law) rules: someone who talks between Yishtabach and Yotzer, the first blessing before Shema, has a sin on his hands, "and goes back from the battle lines because of it." The Beit Yosef, by the same author, says the wording comes from the Yerushalmi (the Gemara of the Land of Israel).
The war is in the Torah. Before a battle, officers announce: "Who is afraid and soft-hearted? Let him go home." In the Mishnah, Rabbi Akiva reads it plainly: someone who cannot face a drawn sword. Rabbi Yosei HaGelili says it means someone afraid because of his sins. The Gemara uses the same phrase for talking between putting on the two tefillin. The Mishnah Berurah explains: talking here is that kind of sin.
Why is this moment so sensitive? The Beit Yosef quotes the Kol Bo, an early law book: Baruch She'amar was set together with the prayer, so you set out God's praise and then pray. You do not talk between the praise and the prayer.
The Mishnah Berurah also brings a mystical reason, citing Mateh Moshe (a book of customs from Poland, late 1500s). Forces that block prayer are cut off by the morning songs. When you talk, they come back.
Shulchan Aruch, Orach Chaim 54:3,Beit Yosef, Orach Chaim 54,Devarim 20:8,Mishnah Sotah 8:5,Sotah 44b,Mishnah Berurah 54:5The first letters spell Shlomo. Did King Shlomo write this?
Take the four words after yishtabach: shimkha, la'ad, malkeinu, ha'El. Their first letters spell Shlomo. That part is not in doubt. Count them yourself.
What it means is less clear. Abudarham (a commentary on the prayers from Seville, about 1340) points it out and offers a guess: maybe the scholar who wrote this blessing was named Shlomo, and he wrote it in honor of King Shlomo. The Chida (Rabbi Chaim Yosef David Azulai, a great Sephardic scholar of the 1700s) mentions the same letters and adds that "some say" Shlomo composed it. Neither one claims to know.
Is the blessing old? The Gemara speaks of a "blessing of song" said at the Seder after Hallel. Rav Yehuda says it is Yehalelucha. Rabbi Yochanan says it is Nishmat. The Tur (a code of Jewish law from the 1300s) understands Rabbi Yochanan to mean Nishmat closing with Yishtabach. That is the Tur's reading. The Gemara does not quote the words.
The Chida offers a second way to read the opening letters. Yishtabach, shimkha, la'ad, malkeinu spell yeshalem, "He will pay." God in His kindness pays even those who praise Him, though we have no words for it and our minds are too small. The little we praise is precious to Him and accepted.
So who wrote it? None of these sources names the author for certain. The hidden name is real. Who stands behind it is still a guess.
Abudarham, Songs of Praise,Chida, Simchat HaRegel on the Haggadah,Pesachim 118a,Tur, Orach Chaim 480