Is this what you are thinking of, Bonnie and Clyde:
*** w85 2/15 pp. 17-18 The "Other Sheep" and the Lord’s Evening Meal ***
The Passover and the Memorial
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Some have suggested that the increasing great number of "other sheep" should partake of the emblems. Their reasoning is: Since "the Law has a shadow of the good things to come," and since one of the requirements of the Law was the keeping of the Passover by both Israelites and circumcised alien residents, this would imply that both classes of sheeplike ones in the "one flock" under the "one shepherd" ought to partake of the Memorial emblems. (Hebrews 10:1; John 10:16; Numbers 9:14) This raises an important question: Was the Passover a type of the Memorial?
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It is true that certainfeatures of the Passover observance in Egypt were undoubtedly fulfilled in Jesus. Paul likens Jesus to the Passover lamb, saying, "Christ our passover has been sacrificed." (1 Corinthians 5:7) The sprinkling of the Passover lamb’s blood on the doorposts and lintels assured deliverance for the firstborn within each Israelite home. Similarly, it is through the sprinkling of Christ’s blood that "the congregation of the firstborn who have been enrolled in the heavens" receive their deliverance, or "release by ransom." (Hebrews 12:23, 24; Ephesians 1:3, 7) Furthermore, not a bone of the Passover lamb was to be broken, and this also found fulfillment in Christ Jesus. (Exodus 12:46; Psalm 34:20; John 19:36) Hence, it is true to say that the Passover, in certain respects, was one of the many features in the Law that provided "a shadow of the good things to come." All these features pointed forward to Christ Jesus, "the Lamb of God."—John 1:29.8
Nevertheless, the Passover was notstrictly a type of the Lord’s Evening Meal. Why not? When the Passover was instituted in Egypt, the flesh of the roasted lamb was eaten, but none of the blood of the Passover lamb was eaten. In contrast, however, when Jesus instituted the Memorial of his death he specifically instructed those then present to eat his flesh and drink his blood, symbolized by the bread and the wine. (Exodus 12:7, 8; Matthew 26:27, 28) In this very important aspect—the blood—the Passover was not a type of the Lord’s Evening Meal.
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There is something else that should not be overlooked. Jesus discussed two related covenants with his disciples, "the new covenant" and ‘a covenant for a kingdom.’ (Luke 22:20, 28-30) Both covenants had to do with the partakers’ being in line to share as priests and kings with Christ Jesus. But in Israel no circumcised alien resident could ever become a priest or a king. In this respect, also, we find a distinction between the Passover feast in Israel and the Lord’s Evening Meal.10
So to what conclusion does this lead us? The fact that the circumcised alien resident ate of the unleavened bread, bitter herbs, and lamb of the Passover does not establish that those today of the Lord’s "other sheep" who are present at the Memorial should partake of the bread and the wine.