I only pointed to the sitting down at the right hand to show there were two.
Regarding the work, sure, He met with Abraham. All of chapter 18 of Genesis is about the Lord meeting with Abraham. He spoke to Moses in the Burning Bush. In John 8:58 Jesus said He was I am.
56 Your father Abraham rejoiced to see my day: and he saw it, and was glad.
57 Then said the Jews unto him, Thou art not yet fifty years old, and hast thou seen Abraham?
58 Jesus said unto them, Verily, verily, I say unto you, Before Abraham was, I am.
59 Then took they up stones to cast at him: but Jesus hid himself, and went out of the temple, going through the midst of them, and so passed by. (Jn. 8:56-9:1 KJV)
Notice Jesus said, before "Abraham was, I am". He used the present tense. He didn't say before Abraham was, I was. He said I am. That's what the Angel of the Lord said in the Burning Bush. Tell him I am sent you.
And God said unto Moses, I AM THAT I AM: and he said, Thus shalt thou say unto the children of Israel, I AM hath sent me unto you. (Exod. 3:14 KJV)
Jesus was claiming that He was the one who spoke to Moses from the Bush
The Rock that followed Israel through the wilderness was Christ.
Moreover, brethren, I would not that ye should be ignorant, how that all our fathers were under the cloud, and all passed through the sea;
2 And were all baptized unto Moses in the cloud and in the sea;
3 And did all eat the same spiritual meat;
4 And did all drink the same spiritual drink: for they drank of that spiritual Rock that followed them: and that Rock was Christ. (1 Cor. 10:1-4 KJV)
There are plenty of examples of Christ moving throughout the Old Testament