Adam Clarke on Matthew 13:35

By the prophet - As the quotation is taken from Psa 78:2, which is attributed to Asaph, he must be the prophet who is meant in the text; and, indeed, he is expressly called a prophet, 1Chr 25:2. Several MSS. have Ησαιου, Isaiah; but this is a manifest error. Jerome supposes that Asaph was first in the text, and that some ignorant transcriber, not knowing who this Asaph was, inserted the word Isaiah; and thus, by attempting to remove an imaginary error, made a real one.