Genesis 18 begins with the verses – “And the Lord appeared unto him in the plains of Mamre: and he sat in the tent door in the heat of the day; And he lift up his eyes and looked, and, lo, three men stood by him:

While the identity of two of the three men is not explicitly stated in this account, from Genesis 19:1 we can learn that these two were as angels (messengers of God with a mission) and the other first person was the Lord himself.

Close scrutiny of this encounter (experience) reveals a couple of hidden treasures in these two verses. First, the Lord appeared to Abraham (Theophany to Abraham), who sat at the entrance to his tent in the heat of the day. Second, Abraham had to lift up his eyes and look to see three men standing by.

Points to Ponder:
The Lord appears to his people, to you and me, as we search the Bible daily (Acts 17:11) to see glimpses of his infallible, loving and just nature, in the person of Jesus Christ. Many of us are beaten down by the heat of the day i.e., the harsh elements of life itself and our most likely posture is that our faces are down as our spirit is downcast. What we need to do is to lift up our eyes (of understanding – Ephesians 1:18) and look up at the Lord, from whom our help comes from (Psalms 121:1-2)
Are you lifting up your eyes and looking at the Lord? Lift up your eyes and look. Tarry no further!

Genesis 18:1-2a (KJV)
And the Lord appeared unto him in the plains of Mamre: and he sat in the tent door in the heat of the day;
And he lift up his eyes and looked, and, lo, three men stood by him: