Moses
Genesis 18:2ESV·traditional attribution

He lifted up his eyes and looked, and behold, three men were standing in front of him. When he saw them, he ran from the tent door to meet them and bowed himself to the earth

John Calvin Reformed @genevareformer

2. And, lo, three men stood by him. Before Moses prceeds to his principal subject, he describes to us, the hospitality of the holy man; and he calls the angels men, because, being clothed with human bodies, they appeared to be nothing else than men. And this was done designedly, in order that he, receiving them as men, might give proof of his charity.

Matthew Henry Presbyterian @wholebiblehenry

The appearance of God to Abraham seems to have had in it more of freedom and familiarity, and less of grandeur and majesty, than those we have hitherto read of; and therefore more resembles that great visit which, in the fullness of time, the Son of God was to make to the world, when the Word would be flesh, and appear as one of us. Observe here, I.

Commenting on Genesis 18:1-8

John Gill Reformed Baptist @doctorgill

And he lifted up his eyes and looked,.... To see if he could observe any passengers coming that way: and, lo, three men stood by him; having perhaps descended at once from heaven upon the spot near where Abraham sat; for these, whoever they were, appeared in an human form, and they were took by Abraham at first sight to be men, and as such...