Mishnayos Eruchin Perek 8 Mishnah 2

If one said: The field is hereby mine for ten sela, and one other person said: It is mine for twenty, and one said for thirty, and one said for forty, and one said for fifty; and then the one who bid fifty reneged on his offer, the treasurer repossesses from his property up to ten sela and the field is redeemed by the one who bid forty. This ensures that the Temple treasury does not lose. If the one who bid forty sela subsequently reneged on his offer, the treasurer repossesses from his property up to ten sela and the field is redeemed by the one who bid thirty. If the one who bid thirty subsequently reneged on his offer, the treasurer repossesses from his property up to ten sela and the field is redeemed by the one who bid twenty. If the one who bid twenty reneged on his offer, the treasurer repossesses from his property up to ten sela and it is redeemed by the one who bid ten. If the one who bid ten reneged on his offer, the treasurer sells the field at its value and collects the remainder from the property of the one who bid ten, to complete the sum of ten sela. If the owner says he will pay twenty sela and any other person says he will pay twenty sela, the offer of the owner takes precedence, due to the fact that he adds one-fifth.

אָמַר אֶחָד, הֲרֵי הִיא שֶׁלִּי בְעֶשֶׂר סְלָעִים, וְאֶחָד אוֹמֵר בְּעֶשְׂרִים, וְאֶחָד אוֹמֵר בִּשְׁלשִׁים, וְאֶחָד אוֹמֵר בְּאַרְבָּעִים, וְאֶחָד אוֹמֵר בַּחֲמִשִּׁים. חָזַר בּוֹ שֶׁל חֲמִשִּׁים, מְמַשְׁכְּנִין מִנְּכָסָיו עַד עָשֶׂר. חָזַר בּוֹ שֶׁל אַרְבָּעִים, מְמַשְׁכְּנִין מִנְּכָסָיו עַד עָשֶׂר. חָזַר בּוֹ שֶׁל שְׁלשִׁים, מְמַשְׁכְּנִין מִנְּכָסָיו עַד עָשֶׂר. חָזַר בּוֹ שֶׁל עֶשְׂרִים, מְמַשְׁכְּנִים מִנְּכָסָיו עַד עָשֶׂר. חָזַר בּוֹ שֶׁל עֶשֶׂר, מוֹכְרִים אוֹתָהּ בְּשָׁוְיָהּ וְנִפְרָעִים מִשֶּׁל עֶשֶׂר אֶת הַמּוֹתָר. הַבְּעָלִים אוֹמְרִים בְּעֶשְׂרִים, וְכָל אָדָם אוֹמְרִים בְּעֶשְׂרִים, הַבְּעָלִים קוֹדְמִים, מִפְּנֵי שֶׁהֵן מוֹסִיפִין חֹמֶשׁ: