A large number of verses, collectively known as “Uva L’Tziyon” (from this verse) is recited at the end of the morning service. The redeemer is the moshiach (the messiah) and Tziyon (Zion) refers specifically to the Temple mount, or more generally to Jerusalem. Rashi explains that the moshiach will not come when Jerusalem lies in ruins. (Please note that in our day, Jerusalem is not in ruins!)