Why does it say "Lachem Ko Amar Hashem"?
Radak #1: Above corresponded to the generation of the Navi; they served idolatry. It cannot be that also this Parashah discusses them, for all of them were exiled - Tzadikim and Resha'im. Also some of the Tzadikim died via the sword - "Nasenu Es Nivlas Avadecha Ma'achal l'Of ha'Shamayim" (Tehilim 79:3). "U'Manisi Eschem la'Cherev" (12) applies to absolute Resha'im who anger Hashem with idolatry. Not one of them remained. The others were exiled - Tzadikim and those who are not total Tzadikim. Even though some died, "Kel Emunah v'Ein Avel" (Devarim 32:4). We do not question what He did. Rather, refer to 65:13:1:3.
Radak #2: If this Parashah discusses those who ascended from Galus, like it is written that He will refine them when they ascend from Galus, it is not connected to the previous Parashah. Also, it says "v'Atem Tir'avu" - this implies that it discusses those mentioned above. Rather, refer to 65:13:1:3.
Radak #3: It seems that these verses are a metaphor for reward in the world to come. First it discusses punishment in this world - "u'Manisi Eschem la'Cherev", and now it tells their punishment in the world to come. "Avadai Yochelu" - their intellectual Nefesh will attain knowledge of Hashem. This will delight their Nefesh, like eating and drinking delights the body. "Hoy Kol Tzamei Lechu la'Mayim... Lechu Shivru ve'Echolu; ... Shamo'a Elai v'Ichlu Tov" (55:1-2) - all of this is a metaphor for Chachmah. "Lo Ra'av la'Lechem v'Lo Tzamei la'Mayim Ki Im Lishmo'a Divrei Hashem" (Amos 8:11), "Tzam'ah Nafshi lEi'lokim" (Tehilim 42:3). There is much like this in Sefer Mishlei. Chazal gave a metaphor for reward and punishment in the world to come like this, based on these verses (refer to 65:13:3:1).
Who are "Avadai"?
Rashi: Tzadikim [some texts - of Yisrael].
Why does it say "Avadai Yochelu v'Atem Tir'avu Hine Avadai Yishtu v'Atem Titzma'u"?
Radak citing Shabbos 153a: One should repent every day, lest he die tomorrow - "b'Chol Es Yihyu Vegadecha Levanim v'Shemen Al Roshcha Al Yechsar." A parable for this is a king who invited his servants to a feast, but he did not fix a time. The smart ones knew that the king does not lack anything (the feast may be at any moment.) The fools did their chores. Suddenly, the king told them to come. The smart ones were adorned nicely, they ate and drank. The king commanded the fools to watch those enjoying the feast. R. Meir says, if so, the fools would not be ashamed in front of the others! Rather - refer to 65:13:5:1.
Malbim: Avadai Yochelu... contrasts to "ha'Orchim la'Gad Shulchan" (11); "Avadai Yishtu" contrasts to "veha'Memal'im la'Mni mi'Mesach" (ibid.)
Who are "v'Atem"?
Rashi: Those who sin against Me.
Malbim: "Ha'Orchim la'Gad Shulchan veha'Memal'im la'Mni mi'Mesach" (11).
Why does it say "Avadai Yismachu v'Atem Tevoshu"?
Radak citing Shabbos 153a: Both of them sit at the feast (refer to 65:13:3:1). The smart ones eat and drink, and the fools sit hungry and thirsty.
Malbim: They will be ashamed of the gods that they chose.
