דִּבְרֵ֣י עָמ֔וֹס אֲשֶׁר־הָיָ֥ה בַנֹּקְדִ֖ים מִתְּק֑וֹעַ אֲשֶׁר֩ חָזָ֨ה עַל־יִשְׂרָאֵ֜ל בִּימֵ֣י ׀ עֻזִיָּ֣ה מֶֽלֶךְ־יְהוּדָ֗ה וּבִימֵ֞י יָרָבְעָ֤ם בֶּן־יוֹאָשׁ֙ מֶ֣לֶךְ יִשְׂרָאֵ֔ל שְׁנָתַ֖יִם לִפְנֵ֥י הָרָֽעַשׁ׃
The words of Amos, who was among the herdmen of Tekoa, which he saw concerning Israel in the days of Uzziah king of Judah, and in the days of Jeroboam the son of Joash king of Israel, two years before the earthquake.
Mishnah Parah
Lambs no more than one year old, And rams no more than two years old. And all these years are reckoned from day to day. One that is thirteen months old is not valid, neither as a ram nor as a lamb. Rabbi Tarfon called it palges. Ben Azzai called it noked. Rabbi Ishmael called it parakhrigma. If a man offered it he must bring for it the libation of a ram, but it is not counted as his offering. One that is thirteen months old behold it is a ram.