What is "Avnei ha'Sadeh"?
Rashi: It is a kind of person. In Kil'ayim 8:5 and Toras Kohanim (Shemini 103) it is called Adnei ha'Sadeh.
Ibn Ezra, Malbim: They are rocks. It is as if you have a Bris with them - you will not be hurt on them. Devar Eliyahu - the verses list seven benefits corresponding to [the seven afflictions]. He will have such Shalom, that he will not even bang his foot on a rock.
Devar Eliyahu: There will be no prosecution, even from rocks - "Even mi'Kir Tiz'ak."
What is "Chayas ha'Sadeh"?
Rashi (21, 23): This is truly wild beasts. Chayas ha'Aretz (22) is a bandit. Devar Eliyahu - even if he will be in forests where wild beasts roam, they will not harm him.
What is the meaning of "Hashlamah Lach"?
Rashi: It will be at peace with you. Malbim - so Moshe said "Al Kapayim Yisa'unecha Pen Tigof ba'Aven Raglecha; Al Shachal va'Fesen Tidroch."
