To debate is to discuss with proofs, and the Jews are people of contention. They are used to always debate with the Prophet r. So, say to them, Oh Muhammad, that Allah is the Lord of all the worlds, and not just the Lord of Muslims alone nor just the Lord of the Jews alone nor the Lord of just one religion from amongst the religions exclusively. And the proof for this is that we begin our prayers saying:
﴾الحَمدُ لِلَّهِ رَبِّ العالَمينَ﴿
“All praises is (due) to Allah, Lord of the worlds” [Surah Al-Fatihah: 2].
The Muslims are not divisive and we will say what the Noble Qur’an says,
﴾وَهُوَ رَبُّنا وَرَبُّكُم﴿ “He is our Lord and your Lord”.