Jesus was teaching Jews on the Mt. of Olives. Jesus is referencing the Old Testament, which the Jews asking questions of him would have memorized. Jesus was calling himself Yahweh (God of the Bible in Hebrew). Jesus is show to be eternal and a part of the Trinity a number of times in the Bible.

Hebrews 11:27 reads, ““He considered the reproach of Christ greater wealth than the treasures of Egypt, for he was looking to the reward.” Speaking about Moses, thousands of years before Christ birth, yet he knew Christ.

Jesus said in John 5:46, ““For if you believed Moses, you would believe me; for he wrote of me.”

There are many many examples.