In those days I Daniel was mourning,.... Either on account of what had been revealed to him in the last vision or prophecy of the seventy weeks; by which it appeared what wickedness the people of the Jews would be guilty of in cutting off the Messiah; and what desolations would come upon their land, city, and temple, for such usage of him: as also because of the present case of his people; many of them continuing in the country of Babylon, when they had liberty to return to their land: or because of the hinderance the Jews met with in rebuilding their city and temple, who had returned thither; of which Daniel had an account, and which caused him to mourn in secret: and so he continued three full weeks; or, "three weeks of days" (c); so called, to distinguish them from weeks of years, mentioned in the preceding chapter. (c) "tribus hebdomadibus dierum", Munster, Calvin, Tigurine version; "trium hebdomadarum diebus", V. L. Pagninus, Montanus, so Junius & Tremellius, Medus.