Albert Barnes Commentary Lamentations 1:7

"Jerusalem remembereth in the days of her affliction and of her miseries all her pleasant things that were from the days of old: When her people fell into the hand of the adversary, and none did help her, The adversaries saw her, they did mock at her desolations." — Lamentations 1:7 (ASV)

Jerusalem remembers in the days of her affliction,
And of her homelessness,
All her pleasant things which have been from the days of old:
Now that her people fall by the hand of the adversary,
And she has no helper;
Her adversaries have seen her,
They have mocked at her sabbath-keepings.

The word rendered “homelessless” means wanderings, and describes the state of the Jews, cast out from their homes and about to be dragged into exile.

Sabbaths - Or, sabbath-keepings, and the cessation from labor every seventh day struck foreigners as something strange, and provoked their ridicule.