What are the ramifications of the comparison of "Acheres" to the Meyu'edes?
Kidushin: It teaches us that an Amah Ivriyah can be acquired with Kesef - just like a woman who is being betrothed.
Yerushalmi Kidushin, 1:1: It teaches us that a woman can be betrothed with Kesef - just like an Amah Ivriyah can be acquired with a Sh'tar. 1
Mechilta: Bearing in mind that this Pasuk is referring to the master's son, that a father is obligated to marry off his son whilst he is still a Katan, 2 we learn from the fact that he (the father) is already obligated to pay for the upkeep of the Meyu'edes, he is now obligated to pay for the upkeep of the second wife as well. 3 ,
Refer to 21:8:2.1:1.
Who is thirten but who is still eating at his father's table (Malbim).
See Torah Temimah, note 82.
Who is meant by Acheres?
Oznayim la'Torah (citing one opinion in the Mechilta): Presumably, the Torah is referring to a Bas Yisrael (and not another Amah Ivriyah). 1
Oznayim la'Torah: As implied by the word "Yikach lo" - and the Torah is teaching us that he is nevertheless not permitted to detract one iota from his obligations towards his erstwhile Amah Ivriyah.
What is "She'er"?
Rashi (citing the Mechilta), Ramban #1 (in Pasuk 9, citing Targum Onkelos), Rashbam, and Targum Yonasan: Sustenance. 1
Ramban #2 (in Pasuk 9): Proximity of flesh at the time of intimacy. 2
As in Michah, 3:3 (Rashbam), and in Tehilim, 78:27 (Ramban). See Ramban's objections to this explanation
As the Torah writes in Bereishis, 2:24 "ve'Davak be'Ishto Vehayu le'Bsar Echad". See also, for example Vayikra 18:6,17. This is also the opinion of the Gemara in Kesuvos, 48a (Ramban) though the Gemara there on 47b explains "She'eirah" like Rashi..
What is "K'sus"?
Rashi (citing the Mechilta), Targum Onkelos and Targum Yonasan: Clothes.
Ramban (on Pasuk 9): Bedding. 1
Rashbam: Ornaments.
Like the Pasuk later in 22:26.
What is the meaning of "Onasah Lo Yigra"?
Rashi (citing the Mechilta), Ramban (on Pasuk 9), Rashbam, Targum Onkelos and Targum Yonasan: 'He shall not detract from her designated times of intimacy. 1
Rashbam: He shall not withhold from her a place to live. 2
Nedarim, 15b: It also teaches us that the husband is duty-bound to givr his wife intimacy and that if he makes a Shevu'ah not to do so, the Shevu''ah is invalid. 3
Ramban: The Torah is warning the son here, that in the event that he marries another wife, he may not relegate the Meyu'edes to the status of a concubine, by being intimate with her only casually, clothed and on the floor, whilst he is intimate with his second wife regularly, on a bed and without clothes.
Like the word "Me'onah" (the 'Mem' of which is dispensable [See Rashbam]).
Nedarim (Ibid.): However, if he makes a Neder 'Hana'as Tashmishech alai', the Neder is valid. See Torah Temimah, note 85.
What is "Im Acheres Yikach lo..." coming to teach us?
Seforno: We learn that a man may not marry more women if he cannot provide his obligations to them. 1
Kidushin 16a: It equates an Amah to an Arusah. Just like a document can be Mekadesh, it can acquire an Amah.
Rashi: If one marries a woman in addition to the Meyu'edes, he must still fulfill his obligations to the Meyu'edes.
Aruch ha'Shulchan (EH 26:8, based on the Rambam): It teaches us that if one is Mekadesh a woman, these obligations come after marriage, but a Meyu'edes is like a concubine, in which case these obligations do not apply. 2
To whom is "She'erah, K'susah,and Ona'asah" referring?
Mechilta: It is referring to the Bas Yisrael - not to the Amah Ivriyah. 1
Mechilta: Because we know the Amah Ivriyah from "ke'Mishpat ha'Banos Ya'aseh lah". See also Torah Temimah, note 86.
What are the ramifications of the comparison of "She'er, K'sus,and Ona'ah"?
Kesuvos, 48a: It teaches us that he must give her clothes a. according to her 'body' ("She'eirah") - depending upon whether she is a young girl or an older woman; b. according to the season ("Onasah") - new clothes in the winter, worn clothes in the summer.
