Charles Ellicott Commentary Jeremiah 7:4

"Trust ye not in lying words, saying, The temple of Jehovah, the temple of Jehovah, the temple of Jehovah, are these." — Jeremiah 7:4 (ASV)

Trust ye not in lying words ... —The emphatic threefold repetition of the words thus condemned, “The temple of the Lord,” points to it having been the main theme of the discourses of the false prophets, possibly to the solemn repetition of the words in the litanies of the supplicants. With no thought of the Divine Presence of which it was the symbol, they were continually harping on its greatness, identifying themselves and the people with that greatness, and predicting its perpetuity.

So in Matthew 24:1 the disciples of our Lord point, as with a national pride, to the buildings of the later Temple. The plural “these” is used rather than the singular, as representing the whole complete fabric of courts and porticoes. The higher truth that the “congregation” of Israel was the living Temple (1 Corinthians 3:16; 1 Peter 2:5), was not likely to be in the thoughts of those whom Jeremiah rebuked.