1)
What is the meaning of "Tezor Masnecha"?
1.
Rashi: Be zealous, like a warrior.
2.
Radak: Go quickly, like it says about Eliyahu "va'Yshanes Masnav va'Yaratz Lifnei Achav" (Melachim I, 18:46).
2)
What is this mission of Yirmeyah?
1.
Malbim: Before I seat these evil judges, I will warn them via you, just like we warn litigants via a Shali'ach of Beis Din. Go to them; do not wait for them to come to you.
3)
What is the meaning of "Pen Achitecha"?
1.
Radak: If you do not fear them and trust in Me, I will save you from them. If you fear them, I will cut you and make you fall in front of them.
2.
Malbim: If you omit from My words to flatter them, I will cut you in front of them.