(Devarim 13:9) "You shall feel no affection for him": Because it is written (Vayikra 19:12) "And you shall love your neighbor as yourself," I might think that you shall love this one (the inciter), too; it is, therefore, written "You shall feel no affection for him."

Because it is written (Shemoth 23:5) "Unload shall you unload (his animal) with him," I might think that you should unload for this one, too; it is, therefore, written "and you shall not hearken to him."

Because it is written (Vayikra 19:16) "And you shall not abide the (spilling of the) blood of your neighbor," I might think that the same applied to this one, too; it is, therefore, written "and your eye should not look mercifully upon him."

"and you shall not pity": You shall not argue in his defense.

"and you shall not shield him": If you know something against him, you may not remain silent.

Whence is it derived that if he leaves beth-din incriminated, he is not to be returned for acquittal? From (Devarim, Ibid. 10) "But kill (shall you kill him.")

And whence is it derived that if he leaves beth-din acquitted, he is to be returned for incrimination? From "shall you kill him."

"Your hand shall be against him first to put him to death": It is a mitzvah for the one incited to put him to death, and, afterwards, (if he did not die under his hand), by all men, it being written "and the hand of all the people afterwards."