Genesis 18:2 And he lift his eyes and looked, and, lo, three men stood by him: and when he saw them, ran to meet them from the tent door, and bowed himself toward the ground.
The Lord appeared to Abraham once again while he sojourned in Hebron. In this appearance He made the promise that this time next year Sarah shall have a son. This time the Lord appeared as three men. Perhaps this was a hint at the Triune nature of God. Abraham responded to God showing up by running to meet them and bowing down. He likely recognized them as God (in human form). Since the Lord had appeared and spoken to him seven times before, he was familiar with Him.
The Lord shows up in our lives with covenant promises in the Gospel and the Sacraments. For this reason we also run to church to meet the Lord who is coming to us to worship Him. Bowing down is an outward sign of praising Him for His majesty and thanking Him for His grace. We are confessing: ”Jesus is Lord!”
Whenever we hear the Gospel the Triune Lord God is appearing and speaking to us. Our response to the Gospel is an enthusiastic welcome of Jesus into our believing hearts. ”But to all who did receive him, who believed in his name, he gave the right to become children of God [John 1:12].” May we all go to church to eagerly hear the Gospel and worshipfully welcome Jesus as Lord.