Who was the God of the OT? Abraham wrestled with the GOD (Genesis 32:24-30). (Gen. 17:1) – “Now when Abram was ninety-nine years old, the LORD appeared to Abram and said to him, "I am God Almighty; Walk before Me, and be blameless; (Gen. 18:1) Now the LORD appeared to him by the oaks of Mamre, while he was sitting at the tent door in the heat of the day.” (Exodus 6:2-3) – “God spoke further to Moses and said to him, "I am the LORD; 3and I appeared to Abraham, Isaac, and Jacob, as God Almighty , but by My name, LORD, I did not make Myself known to them.” (Exodus 24:9-11) – “Then Moses went up with Aaron, Nadab and Abihu, and seventy of the elders of Israel, 10and they saw the God of Israel; and under His feet there appeared to be a pavement of sapphire, as clear as the sky itself. 11Yet He did not stretch out His hand against the nobles of the sons of Israel; and they saw God, and they ate and drank.” (Num. 12:6-8) – “He said, "Hear now My words: If there is a prophet among you, I, the LORD, shall make Myself known to him in a vision . I shall speak with him in a dream. 7"Not so, with My servant Moses, He is faithful in all My household; 8With him I speak mouth to mouth, Even openly, and not in dark sayings, And he beholds the form of the LORD. Why then were you not afraid To speak against My servant, against Moses ?" (Acts 7:2), "And he [Stephen] said, "Hear me, brethren and fathers! The God of glory appeared to our father Abraham when he was in Mesopotamia, before he lived in Haran. . . " The solution is simple. All you need to do is accept what the Bible says. If the people of the OT were seeing God - the Almighty God, and Jesus said that no one has ever seen the Father (John 6:46), then they were seeing God Almighty, but not the Father. It was someone else in the Godhead. I suggest they were seeing the Word before He became incarnate. In other words, they were seeing Jesus.