Reference for Pesachim 190:7

דוחה את הטומאה כמאן כר' יהודה

- The Torah sought [means] for him to keep it in cleanness; yet if he was not privileged [thus], he must keep it in uncleanness. Our Rabbis taught: The first Passover overrides the Sabbath, [and] the second Passover overrides the Sabbath; the first Passover overrides uncleanness,[and] the second Passover overrides uncleanness; the first Passover requires the spending of the night [in Jerusalem], [and] the second Passover requires the spending of the night [in Jerusalem].'

Jastrow