“ And the same distance in any direction [from Jerusalem is a distant journey] —
[These are] the words of Rabbi Akiva.
Rabbi Eliezer says:
[A journey is distant anytime one leaves] from the threshold of the Temple Court and beyond. ”

“ If so [asked the Mishnah] ,
Why is it said (in Numbers 9:10) :
[That those] “unclean [by reason of contact with a dead body] or on a distant journey” [observe the second Passover] ?
[The Mishnah answers:
It is to teach] that these [“unclean by reason of contact with a dead body or on a distant journey”] are exempt from being cut off from their kin,
But those [who deliberately fail to observe the Passover] are liable to being cut off from their kin.
Mishnah 2
What is “a distant journey” (within the meaning of Numbers 9:10) ? ”