וַאֲנִ֣י דָנִיֵּ֗אל נִהְיֵ֤יתִי וְנֶֽחֱלֵ֙יתִי֙ יָמִ֔ים וָאָק֕וּם וָאֶֽעֱשֶׂ֖ה אֶת־מְלֶ֣אכֶת הַמֶּ֑לֶךְ וָאֶשְׁתּוֹמֵ֥ם עַל־הַמַּרְאֶ֖ה וְאֵ֥ין מֵבִֽין׃ (פ)
And I Daniel fainted, and was sick certain days; then I rose up, and did the king’s business; and I was appalled at the vision, but understood it not.
Read halakhic rulings (Jewish law) on Daniel 8:27: and classical halakhic sources.