C. F. Keil and Franz Delitzsch on Leviticus 26:44

Lev 26:44 “And yet, even with regard to this, when they shall be in the land of their enemies, have I not despised them.” That is to say, if it shall have come even so far as that they are in the land of their enemies (the words גּם־זאת stand first in an absolute sense, and are strengthened or intensified by ואף and more fully explained by בּהיותם וגו), I have not rejected them, to destroy them and break My covenant with them. For I am Jehovah their God, who, as the absolutely existing and unchangeably faithful One, keeps His promises and does not repent of His calling (Rom 11:29).