Those satiated with bread - why were they hired?
Rashi: Initially, they did not need to hire themselves out. They became hungry, and hire themselves to earn income for food.
Bi'ur ha'Gra: This refers to the Giv'onim, who became slaves to cut wood and draw water.
What is the meaning of "Chadelu"?
Rashi: They ceased from their toil [Radak - for their food. They are satiated through Hashem's desire.]
Radak: This entire Shirah refers to worldly matters. People depend on Hashem. With His will, he does to them as He wishes. If people see something unlike their desire, they should pray to Hashem with all their Nefesh, like I did, and He will give to them their desires and needs. His Hashgachah is on lower beings, just like it is on higher beings, like she said at the end "la'Shem Metzukei Eretz va'Yashes Aleihem Tevel" (verse 8).
Bi'ur ha'Gra: Yisrael, about who it says in the Midbar "va'Ya'ancha va'Yar'ivecha" (Devarim 8:3), found in Eretz Yisrael houses full of all good (and ceased to be hungry). Aderes Eliyahu - they took the spoils of Sichon and Og.
Why does it say "Ad Akarah Yoledes Shiv'ah v'Rabas Banim Umlalah"?
Rashi: While the barren woman gives birth to seven, the one who had many children is bereft and buries her children. Chanah gave birth to seven (refer to 2:5:4:1, 2), and Peninah was bereft.
Radak: If Yisrael will be afflicted in exile under idolaters who are compared to Rabas Banim (a woman with many children), and she is haughty about them and happy and always glorifies herself about them to the point that she pains and does evil to the barren woman. Keneses Yisrael is compared to a barren woman with few children, like it says in Yeshayah (54:1, "Rani Akarah Lo Yaladah") and may other places. Even if this Akarah had few children, time will come when she will have many children, when they return to Hashem with all their heart and pray to Him in their exile and affliction. Then Rabas Banim will be bereft. She will cease to give birth and succeed, and what she already gave birth to will be cut off. This refers to the coming of Mashi'ach and the return of Yisrael to their land and the death of those with Gog and Magog.
Bi'ur ha'Gra: Yisrael, who were barren 1 , conquered the seven Kena'ani nations. Rabas Banim refers to all the nations, for every king had a palace in Eretz Yisrael.
Aderes Eliyahu: Avraham and Sarah were barren. She gave birth, and the seventh generation (Moshe 2 , when the Emori's measure of sin was full) dispossessed v'Rabas Banim (the seven Kena'ani nations).
QUESTIONS ON RASHI
Rashi writes that "Akarah Yoledes Shiv'ah" applies to Chanah. It says (verse 21) "Sheloshah Banim u'Shtei Banos"!
Rashi citing R. Nechemyah (Midrash Shmuel 5:10): Each time she gave birth to one, Peninah buried two of her 10. In Chanah's fifth pregnancy, Peninah bowed down to her and asked for mercy, and her last two lived; they were called on Chanah's name.
Rashi citing R. Yehudah (Midrash Shmuel 5:10): Grandchildren are like children. 1
Rashi: Some say that it says Shiv'ah, for its Gematriya (377) is the same as that of Shmuel.
Radak, Malbim: It is not precise. When the verse wants to say a large amount, it says seven - "Umlalah Yoledes ha'Shiv'ah" (Yirmeyah 15:9), "Sheva k'Chatoseichem" (Vayikra 26:21), "Sheva Yipol Tzadik" (Mishlei 24:16). She said seven, because 2 the world is based on seven - seven stars (the Kochvei Leches) serve, seven days of the week.
I.e. at the time Chanah said this, she had in all seven children and grandchildren. Alternatively, she had seven when Peninah's last children died. (PF)