Albert Barnes Commentary Lamentations 1:10

"The adversary hath spread out his hand upon all her pleasant things: For she hath seen that the nations are entered into her sanctuary, Concerning whom thou didst command that they should not enter into thine assembly." — Lamentations 1:10 (ASV)

Her pleasant things – Chiefly, the sacred vessels of the temple (2 Chronicles 36:10).

Sanctuary ... congregation – Even a Jew might not enter the innermost sanctuary, which was for the priests only; but now the tramp of pagan soldiery has been heard within its sacred precincts.