John Gill Commentary Lamentations 2:7

"The Lord hath cast off his altar, he hath abhorred his sanctuary; He hath given up into the hand of the enemy the walls of her palaces: They have made a noise in the house of Jehovah, as in the day of a solemn assembly." — Lamentations 2:7 (ASV)

The Lord has cast off his altar
Whether of incense, or of burnt offerings; the sacrifices of which used to be acceptable to him. But now, with the altar cast down and demolished, there were no more offerings, nor did he show any desire for them; rather, the reverse was true.

He has abhorred his sanctuary ;
the temple; by suffering it to be profaned, pulled down, and burnt, it looked as if he had an abhorrence of it, and the service in it; as he had, as it was performed without faith in Christ, love to him, or any view to his glory; see (Isaiah 1:13Isaiah 1:14);

He has given up into the hand of the enemy the walls of her palaces ;
both the walls of the sanctuary, and the walls of the houses of the kin, and princes; especially the former are meant, both by what goes before and follows:

They have made a noise in the house of the Lord, as in the day of a
solemn feast ;
that is the enemy, the Chaldeans, made a noise in the temple, blaspheming God, that has dwelt in it; insulting over the people of God, that had worshipped there; rejoicing in their victories over them; singing their "paeans" to their gods, and other profane songs; indulging themselves in revelling and rioting; making as great a noise with their shouts and songs as the priests, Levites, and people of Israel did, when they sung the songs of Zion on a festival day.

The Targum is, ``as the voice of the people of the house of Israel, that prayed in the midst of it in the day of the passover.''