Clement, an early church father, in Clement 1, part
23.5 has the following (underline added) in a section explaining why the things described have not yet happened. Here is the translation by Holmes (underline added).
English: Truly his purpose will be accomplished quickly and suddenly, just as the scripture also testifies. "He will come quickly and not delay; and the Lord will come suddenly into his temple, even the Holy One whom you expect."
Greek: επ αληθειας ταχυ και εξαιφνης τελειωθησεται το βουλημα αυτου, συνεπιμαρτυρουσης και της γραφης οτι ταχυ ηξει και ου χρονιει, και εξαιφνης ηξει ο κυριος εις τον ναον αυτου, και ο αγιος ον υμεις προσδοκατε.
Holmes, M. (2007).
The Apostolic Fathers. 3rd Ed. Grand Rapids, MI: Baker Academic, p. 79.