Rashi on Leviticus 26:41/רש"י על ויקרא כ״ו:מ״א

1והבאתי אתם AND I SHALL BRING THEM [INTO THE LAND OF THEIR ENEMIES] — I Myself shall bring them; this is a kindly measure for Israel in order that they should not say, “Since we are banished among the nations let us do like their doings”. “For”, says God “I will not suffer them to do this, but I will raise up My prophets and so bring them back under My wings, as it is said, (Ezekiel 20:30) “And that which cometh into your mind shall not be at all, — [that ye say, We will be as the heathens, as the families of the countries, to serve wood and stone]. As I live, saith the Lord God, surely with a mighty hand, and with an outstretched arm and with fury poured out, will “I” be king over you etc.” (Sifra, Bechukotai, Chapter 8 5).

2או אז יכנע — The word או here has the same meaning as in (Exodus 21:36) או נודע כי שור נגח הוא (cf. Rashi on that verse and our Note thereon). The translation therefore is: “If then [their uncircumcised hearts] will be humbled”. Another explanation is that או means perhaps, — “perhaps then their uncircumcised hearts will be humbled”.

3ואז ירצו את עונם means, and they will atone for their iniquities by the punishments they will have suffered.