Why is one who does so happy?
Malbim: His deeds will reveal the Tzedakah, and the salvation will come.
What is "Ya'aseh Zos"?
Rashi: He guards Shabbos
Why does it mention "Enosh" and "Ben Adam"?
Malbim: Even Ben Adam, who is a lower level than Enosh, and he does not do so absolutely, just he strengthens himself in it lest he falter, will reveal the Tzedakah, and the salvation will come.
What is the meaning of "Yachazik Bah"?
Radak: He is careful about it all his days.
Malbim: Refer to 56:2:3:1.
Why does it specify particularly Shabbos?
Radak: It discusses Bnei Galus fixing their ways and leaving Galus. The best [Tikun] is guarding Shabbos; due to the sin of [Chilul] Shabbos, they were exiled from their land - "umi'Shabsosai Helimu Eineihem va'Echal b'Socham" (Yechezkel 22:26); if Yisrael would guard two Shabbosos, they would be redeemed immediately - "Asher Yishmeru Es Shabsosai
What is the meaning of "me'Chalelo"?
Radak: He does not do any Melachah. It is also included in "Zachor Es Yom ha'Shabbos Lekadesho" (Shemos 20:8). Kidush Shabbos is to separate it from other days. Kedushah always refers to a separate level, e.g. "va'Yavdel Aharon Lehakdisho Kodesh Kodoshim" (Divrei ha'Yamim I, 23:13). He separates it from other days via eating, drinking and clean clothing - this pertains to the body. Regarding the Nefesh, it is free from worldly engagements and refrains from them, and engages in Divrei Torah, Chachmah and contemplating Hashem's acts. Even though Shabbos is feminine, it says me'Chalelo (masculine), for it refers to Yom ha'Shabbos.
What is "me'Asos Kol Ra"?
Radak: This is a Klal for Lavim.
Malbim: This refers to [evil] Bein Adam l'Chavero.
