God forbid that I should sin - They had earnestly begged him, 1Sa 12:19, to pray to God for them, that they might not die; and he tells them that he should consider himself a sinner, should he cease to be their intercessor.
But I will teach you the good and the right way - I will show you, as long as I am with you, what true religion is; it is the way to happiness and heaven. It is right - there is no crookedness in it; it is good - there is no evil in it.