Charles Ellicott Commentary Deuteronomy 30:3

"that then Jehovah thy God will turn thy captivity, and have compassion upon thee, and will return and gather thee from all the peoples, whither Jehovah thy God hath scattered thee." — Deuteronomy 30:3 (ASV)

The Lord thy God will turn thy captivity.—The word “turn” is not active as we should expect (in Hebrew), but neuter. Upon this fact, the Rabbis have based the following observation: “In some way, the Shechinah abides with Israel during the stress of their captivity, and whenever they are redeemed, He has prescribed redemption for Himself, in that He will return with them.”

Furthermore, they observe that the day of the gathering of the captivity is great and attended with difficulty, as if He Himself must be there to take visible hold of the hand of each one and bring him from his place, as it is said, And ye shall be gathered one by one, O ye children of Israel (Isaiah 27:12).

But it is observed that the same form of the verb is used in Jeremiah with respect to Moab (Jeremiah 48:47). This note at least shows that the Jewish people look for the fulfilment of this prophecy as something still to come.