בִּשְׁנַ֤ת אַחַת֙ לְמָלְכ֔וֹ אֲנִי֙ דָּֽנִיֵּ֔אל בִּינֹ֖תִי בַּסְּפָרִ֑ים מִסְפַּ֣ר הַשָּׁנִ֗ים אֲשֶׁ֨ר הָיָ֤ה דְבַר־יְהוָה֙ אֶל־יִרְמִיָ֣ה הַנָּבִ֔יא לְמַלֹּ֛אות לְחָרְב֥וֹת יְרוּשָׁלִַ֖ם שִׁבְעִ֥ים שָׁנָֽה׃
in the first year of his reign I Daniel meditated in the books, over the number of the years, whereof the word of the LORD came to Jeremiah the prophet, that He would accomplish for the desolations of Jerusalem seventy years.
Read halakhic rulings (Jewish law) on Daniel 9:2: and classical halakhic sources.