Shekalim7: 4
בְּהֵמָה שֶׁנִּמְצֵאת מִירוּשָׁלַיִם וְעַד מִגְדַּל עֵדֶר, וּכְמִדָּתָהּ לְכָל רוּחַ: זְכָרִים עוֹלוֹת, נְקֵבוֹת זִבְחֵי שְׁלָמִים.  רַבִּי יְהוּדָה אוֹמֵר: הָרָאוּי לִפְסָחִים פְּסָחִים, קֹדֶם לָרֶגֶל שְׁלֹשִׁים יוֹם.
An animal that was found between Jerusalem and Migdal Eder or at a similar dis-tance [from Jerusalem] in any direction: males are [assumed to be] burnt-offerings, females are [assumed to be] peace-offerings.  R’ Yehudah says: Those suitable for pesach-offerings are [assumed to be] pesach-offerings, during the thirty days before Pesach.