1)
How would he justify them?
1.
Rashi: To say that they are correct, to say that I am guilty.
2)
Why did he add "until I die"?
1.
Malbim: Even if I will die via not agreeing to your words, Chalilah that I would agree.
3)
What would remove his purity?
1.
Rashi: If I would admit to your words, that I am not pure. Malbim - this would show that my mouth spoke unlike Emes and what is in my heart. This is the opposite of Temimus, which I acquired!
