The Apostle Paul
Romans 11:31ESV·traditional attribution

so they too have now been disobedient in order that by the mercy shown to you they also may now receive mercy.

Matthew Henry Presbyterian @wholebiblehenry

The apostle proposes here a plausible objection, which might be urged against the divine conduct in casting off the Jewish nation (Rom 11:1): "Hath God cast away his people? Is the rejection total and final? Are they all abandoned to wrath and ruin, and that eternal?

Commenting on Romans 11:1-32

John Gill Reformed Baptist @doctorgill

Even so have these also now not believed,.... Now is the time of the Jews' unbelief, blindness has happened to them, the vail is over their hearts; as the Gentiles formerly did not believe God, so the Jews do not now; though they believe there is a God, and that there is but one God, yet they do not believe God in Christ; nor that...

Albert Barnes Presbyterian @notesbybarnes

Verse 31. Even so have these, etc. That is, the Jews. That through your mercy, etc. The immediate effect of the unbelief of the Jews was to confer salvation on the Gentiles or to open the way for the preaching of the gospel to them. But its remote effect would be to secure the preaching of the gospel again to the Jews.