1)
Why did he say "Asher Amadti Lefanav"?
1.
Radak #1: I regular stand in front of Him and pray in front of Him and serve Him in my heart.
2.
Radak #2: I regularly stood in front of Eliyahu. It is as if it says 'Chai Hashem v'Chai Eliyahu, Asher Amadti
2)
Why did Elisha refuse to take it?
1.
Rashi (from Tanchuma Metzora 1): Money of idolatry was mixed with it.
2.
Malbim: According to letter of the law, it was forbidden to cure him 1 . It was permitted only for the sake of Kidush Hashem. Elisha could not take money, since he did so only for Kidush Hashem.
1
YD 158:1: It is forbidden to heal idolaters, unless needed to avoid enmity.
