I say then, Have they stumbled that they should fall? God forbid: but rather through their fall salvation is come unto the Gentiles, for to provoke them to jealousy.
I say then, Have they stumbled ('Did they stumble') that they should fall? God forbid: but [rather].
This supplementary "rather" is superfluous.
Through their fall, х paraptoomati (G3900)] - literally, 'trespass;' probably 'lapse' is best:
Salvation is come unto the Gentiles, for to provoke them to jealousy. Here, as in Romans 10:19 (quoted from Deuteronomy 32:21), we see the principle of emulation divinely called into exercise as a stimulus to what is good.