I believe the first verse in one chapter in Job is “he said”. However, it is generally not separated out. Instead one and two are typically combined together and the next number is 3, or something like that.
There are several chapters in Job with the first verse being roughly "And X replied, saying"
with the rest of the chapter being their reply. Still very much a full sentence that identifies the speaker.
I was thinking of Job 3:2, which, in some modern English translations is simply rendered “He said:”. But the Hebrew is more complete.
King James version also gets it right, but even "He said:" is a complete sentence.