In Genesis chapter 18 three men appear to Abraham. I say appear because he doesn’t observe them approaching from afar, they are just suddenly there. It is gradually revealed that one of them is the Lord (18: 13) and the other two are angels (19: 1). (By way of addition, 9th Feb 2018, I should point out that the church has seen the three as an image of the Trinity, Father, Son and Holy Spirit). The Lord tells Abraham that he will have a son by the time he visits him again next year. They all walk together towards Sodom. The Lord tells Abraham of the fate in store for Sodom and Gomorrah (fate not really being the right word, judgment would be better). The two angels go on into Sodom while the Lord and Abraham have a discussion. Abraham intercedes for Sodom, saying that if there were 50 just men in the city would the Lord spare it. The Lord says he will be spare it for 50 just men. Abraham haggles some more reducing the number of just men required to spare the town to 40,then 30, then 20,then 10 and leaves it there, It makes you wonder if he kept haggling could he have got it down some more. Sadly not even 10 just men are found and the city is destroyed, but Lot is spared with his daughters and his wife because of Abraham. It says that because God kept Abraham in mind (19: 29), Lot is rescued. He gets a free ride. It makes you wonder if our loved ones get a free ride because of us. Whether or not that would extend beyond this world is debateable.
By the way, this same promise of a free ride is given to Rahab by the two spies of Joshua (Joshua 2: 12-14 & 6: 22-23). I know people who have found comfort in this for their loved ones who are not in Christ.
Anyway, my main point is the Lord appeared in human form to Abraham.
In Joshua 5: vs 13-15 the Lord appears to Joshua in human form before the battle of Jericho as the “captain of the Lord’s army”. It says that Joshua worshiped him indicating that this is the Lord and not an angel, as an angel wouldn’t accept worship (Revelation 22: 8-9).
So we have two instances of God appearing to people in human form in the old testament
If we were to speculate about this, God has one human form that we know of and that is Jesus. Is it possible that Jesus met with Abraham and Joshua? I can’t say for definite, that is more than the scripture says. It is just an “I wonder” sort of thing.
Further to this Moses was unable to see God in all his glory as it would have killed him, but he was allowed to see his back (Exodus 33: 18-23). But in Deuteronomy 34: 10 it says that the Lord knew Moses “face to face” (also Numbers 12: 8 where it says Moses sees “the form of the Lord”). We know that Moses met Jesus on the mountain of transfiguration in the new testament (Mark 9: 2-8). Could Moses have also met Jesus in the cloud on the mountain of Sinai (Exodus 24: 16-18)? Do we have two separate events or one event out of time and space? I can’t say and the scripture doesn’t say. It’s just another “I wonder” moment. I like the idea that some people in the old testament met Jesus, though I’m going beyond what the scripture says. All we can be sure of is that God met Abraham and Joshua in human form in the old testament, something wonderful in itself. PTL!
Addition 27/9/18 – It is often the case that the more you look the more you find. So have a look at Genesis 32:24-32, Jacob wrestles with God. Jacob wrestles with a man who turns out to be God in human form. Why Jacob thought he could win is beyond me but he wrestles with this “man” all night and even when the “man” dislocates his hip Jacob will not let him go until he gets a blessing. The blessing he is given is a name change from Jacob to Israel for one who struggles (wrestles) with God. This is the name which is also given to the nation formed from the 12 tribes, that are from the 12 sons of Jacob. The “man” does not give his name, even when asked, but Jacob is in no doubt about who this is. Jacob names the place “Peniel” because he saw God face to face and yet his life was spared. EL means God in Hebrew. IsraEL “struggles with God”. PeniEL – “face of God”.