Charles Ellicott Commentary Deuteronomy 33:28

"And Israel dwelleth in safety, The fountain of Jacob alone, In a land of grain and new wine; Yea, his heavens drop down dew." — Deuteronomy 33:28 (ASV)

Israel then shall dwell in safety — that is, in confidence and security. In His days (the days of Messiah) Judah shall be saved, and Israel shall dwell safely (Jeremiah 23:6), but not until they learn to rest upon the everlasting arms.