What does Ezekiel 44:9 mean?

So here's what the Lord God says: No foreigner, whether they're uncircumcised in heart or body, can come into my sanctuary—not even if they live among the people of Israel. Ezekiel 44:9 - Modern Text Bible

(God sets a clear boundary: only those truly committed to Him, both outwardly and inwardly, can enter the temple.)