23 Heb “and now set your heart from this day and upward.” The juxtaposition of מָעְלָה (ma’lah, “upward”) with the following מִטֶּרֶם (mitterem, “before”) demands a look to the past. Cf. “consider from this day and backward.”
24 Before one stone was laid on another in the Lord’s temple is best taken as referring to the laying of the present temple’s foundation, sixteen years earlier (536 b.c.; see Ezra 3:8). Cf. “before you started laying stones”; “before you started to rebuild”; “before you began to lay (started laying ) the foundation.”

In other versions

Now then, consider from this day onward. Before stone was placed upon stone in the temple of the Lord,

“ ‘Now give careful thought to this from this day on—consider how things were before one stone was laid on another in the Lord’s temple.

“Now from this day on, think carefully: Before one stone was placed on another in the Lord’s temple,

Look at what was happening to you before you began to lay the foundation of the Lord’s Temple.

But now, please consider from this day forward, before one stone was placed on another in the temple of Yahweh,

And now, I pray you, consider from this day and upward,

From before a stone was laid upon a stone in the temple of the Lord:

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