Daniel 1:21 Midrash

וַֽיְהִי֙ דָּֽנִיֵּ֔אל עַד־שְׁנַ֥ת אַחַ֖ת לְכ֥וֹרֶשׁ הַמֶּֽלֶךְ׃ (פ)

And Daniel continued even unto the first year of king Cyrus.

Read midrashic interpretation of Daniel 1:21: and classical rabbinic exegesis.