Upvote:0
According to the interlinear, the original Hebrew text (as best we can reconstruct it) has "he lied," not "the old prophet lied." So, there is no way to know for sure. Sorry.
Upvote:1
Oooor it could have just been the fact that this old prophet plainly lied about seeing an angel just to manipulate the man of God from Judah to disobey God and eat with him. Hospitality was a big thing in Middle Eastern times back then.
But, most importantly, it seems this was a test for the young prophet, not the old prophet, as the former was the focal point of the chapter's story.
Hope these resources help you as well: