Quod si quis peregrinorum in vestram voluerit transire coloniam et facere Pascha Domini, circumcidetur prius omne masculinum eius, et tunc rite celebrabit eritque sicut indigena terræ; si quis autem circumcisus non fuerit, non vescetur ex eo.

English Translation

And if any stranger be willing to dwell among you, and to keep the Phase of the Lord, all his males shall first be circumcised, and then shall he celebrate it according to the manner: and he shall be as he that is born in the land: but if any man be uncircumcised, he shall not eat thereof.

keep the Passover of the Lord?

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Yep, “Phase” was used for “Passover” in the past. Apparently in reference to the phases of the moon. That makes sense, given that the ancient Hebrews used a lunar calendar for their festivals.