1)
Why is it written Avanah, and we pronounce it Amanah?
1.
Radak: The river had both of these names.
2)
If he thought that Tevilah in those rivers would help, why did he not do so?
1.
Radak: He meant, if I can be cured through Tevilah, I can bathe in them to be cured.
2.
Radak citing his father: I bathe in them every day [and it does not help]!
3.
Malbim: If he will purify me in the way of a cure, the Yarden is no better than the rivers of Damesek. If they do not help, also the Yarden will not!
3)
Why did he say "v'Taharti"?
1.
Radak, Malbim: This is said in astonishment. Am I Tahor due to this?!