1)
What is the Chidush that "To'avas Hashem Machshevos Ra?
1.
Malbim: Hashem despises one who speaks pleasant, Tahor words, and inside he plots evil thoughts.
2)
What is the meaning of "u'Tehorim Imrei No'am"?
1.
R. Yonah: It is as if it says ul'Tehorim Imrei No'am 1 . Tehorim are those who a pure heart - "u'Var Levav" (Tehilim 24:4). Only they have pleasant words, for words of rebuke are accepted only from one whose heart is like his mouth.
2.
Malbim: Refer to 15:26:1:1.
1
R. Yonah: Also "Ish Tochachos Maksheh Oref" (29:1) is missing the prefix Lamed.