Mishnayos Sanhedrin Perek 5 Mishnah 3

The mishna clarifies: If one witness says the event occurred on the second of the month, and one witness says that the event occurred on the third of the month, this is not regarded as a contradiction and their testimony stands, since it is possible to say that this witness knows of the addition of a day to the previous month, and according to his tally the event occurred on the second of the month, and that witness does not know of the addition of a day to the previous month, and according to his tally the event occurred on the third of the month. Their testimony is not considered incongruent. By contrast, if this witness says the event occurred on the third of the month and one witness says the event occurred on the fifth of the month, their testimony is void, as this disparity cannot be attributed to a mere error. Therefore, their testimony is not congruent. Similarly, if one witness says that the event occurred at two hours, i.e., the second hour of the day from sunrise, and one witness says that the event occurred at three hours, their testimony stands, as one could reasonably err this amount in estimating the hour of the day. By contrast, if one says that the event occurred at three hours, and one says that the event occurred at five hours, their testimony is void. Rabbi Yehuda says: Also in this case their testimony stands, as one could reasonably err concerning even this length of time. Rabbi Yehuda adds: But if one says that the event occurred at five hours, and one says that the event occurred at seven hours, their testimony is void. Here the difference is recognizable to all, since at five hours the sun is in the east and at seven the sun is in the west, and one could not err concerning this. Therefore, their testimony is not congruent.

אֶחָד אוֹמֵר בִּשְׁנַיִם בַּחֹדֶשׁ וְאֶחָד אוֹמֵר בִּשְׁלֹשָׁה בַחֹדֶשׁ, עֵדוּתָן קַיֶּמֶת, שֶׁזֶּה יוֹדֵעַ בְּעִבּוּרוֹ שֶׁל חֹדֶשׁ וְזֶה אֵינוֹ יוֹדֵעַ בְּעִבּוּרוֹ שֶׁל חֹדֶשׁ. אֶחָד אוֹמֵר בִּשְׁלֹשָׁה וְאֶחָד אוֹמֵר בַּחֲמִשָּׁה, עֵדוּתָן בְּטֵלָה. אֶחָד אוֹמֵר בִּשְׁתֵּי שָׁעוֹת וְאֶחָד אוֹמֵר בְּשָׁלֹשׁ שָׁעוֹת, עֵדוּתָן קַיֶּמֶת. אֶחָד אוֹמֵר בְּשָׁלֹשׁ וְאֶחָד אוֹמֵר בְּחָמֵשׁ, עֵדוּתָן בְּטֵלָה. רַבִּי יְהוּדָה אוֹמֵר, קַיָּמֶת. אֶחָד אוֹמֵר בְּחָמֵשׁ וְאֶחָד אוֹמֵר בְּשֶׁבַע, עֵדוּתָן בְּטֵלָה, שֶׁבְּחָמֵשׁ חַמָּה בַמִּזְרָח וּבְשֶׁבַע חַמָּה בַמַּעֲרָב: