{There appeared} ((9370)hth(885c)). Singular aorist passive verb
with Moses (to be understood also with Elijah), but the
participle sunlalountes is plural agreeing with both.
"Sufficient objectivity is guaranteed by the vision being enjoyed
by all three" (Bruce). The Jewish apocalypses reveal popular
expectations that Moses and Elijah would reappear. Both had
mystery connected with their deaths. One represented law, the
other prophecy, while Jesus represented the gospel (grace). They
spoke of his decease ( Lu 9:31 ), the cross, the theme uppermost
in the mind of Christ and which the disciples did not comprehend.
Jesus needed comfort and he gets it from fellowship with Moses
and Elijah.