John Gill Commentary Ezra 9:4

"Then were assembled unto me every one that trembled at the words of the God of Israel, because of the trespass of them of the captivity; and I sat confounded until the evening oblation." — Ezra 9:4 (ASV)

There were assembled to me everyone that trembled at the
words of the God of Israel
That had a reverence for the word of God, and the things contained in it; feared to break the laws of God, and trembled at his judgments, which they might apprehend would come upon transgressors, see (Isaiah 46:2),

because of the transgression of those that had been carried away ;
into Babylon, and were now returned, and which was an aggravation of their transgression:

and I sat astonished until the evening sacrifice :
or until the ninth hour, as the Syriac version, which was about our three o'clock in the afternoon, at which
time the evening sacrifice was offered; perhaps it was in the morning when Ezra first received his
information from the princes.