John Chrysostom
The individual permitted to partake in the lamb signifies my neighbor, and I am that neighbor, as you, O Israel, do not embody the Lamb.
But if the number be less than may suffice to eat the lamb, he shall take unto him his neighbour that joineth to his house, according to the number of souls which may be enough to eat the lamb.
וְאִם־יִמְעַ֣ט הַבַּיִת֮ מִהְיֹ֣ת מִשֶּׂה֒ וְלָקַ֣ח ה֗וּא וּשְׁכֵנ֛וֹ הַקָּרֹ֥ב אֶל־בֵּית֖וֹ בְּמִכְסַ֣ת נְפָשֹׁ֑ת אִ֚ישׁ לְפִ֣י אָכְל֔וֹ תָּכֹ֖סּוּ עַל־הַשֶּֽׂה׃
5 Church Fathers comment on this verse
The individual permitted to partake in the lamb signifies my neighbor, and I am that neighbor, as you, O Israel, do not embody the Lamb.
In other words, those who lack among them individuals capable of grasping the complete mystery of Christ, or who find themselves hindered by the limitations of their intellect, can still partake in communion with Him by involving fellow believers as colleagues and supporters. Through shared learning and dialogue, we may at times elevate our understanding. This is exemplified by the wise eunuch, who, upon hearing the prophecies regarding Christ, inquired of Philip, “I ask you to say, ‘Of whom does the prophet say this, whether of himself or of someone else?’” (Acts 8:34).
Notice how, by including his neighbor in his quest for understanding—given that we are all united by the same foundation of faith—he became a participant in the spiritual Lamb through his inquiry, ultimately receiving the honor of baptism and becoming one with Christ.
The phrase 'On the tenth day of the month' symbolizes completeness, being the initial unit, the ideal unit, and the origin of perfection. Therefore, it is fitting that a ‘lamb’ is specifically designated for each household, or in times of need, for the marginalized through the flock 'for the households of the homeland.' It is most advantageous for each individual to independently strive for perfection and to present a living, holy, and consistently sanctified offering to God who beckons him. If this is not possible, he should seek support from those who share similar virtues and dispositions. This suggests that in times of need, the sacrifice should also encompass the neighbors. Regarding the lamb, refer to v. 5.
God instructed that the Passover lamb be sacrificed for a sufficient number of participants to partake, thereby instilling a sense of community and generosity towards the less fortunate. Consequently, He decreed that any leftover meat must be consumed on the night of the feast and not stored for the following day, thereby inviting the needy to share in the celebration.
The sacrificial lamb, as we will examine, is to be consumed in its entirety on the day it is offered, leaving no remnants until the following day. However, if a household lacks enough members to eat the whole lamb, the head of that household is obligated to unite with one or more adjacent families, depending on the number of participants needed. Over time, customs have established that this meal should involve at least ten individuals and no more than twenty.