In the OLD TESTAMENT there are many scriptures concerning the COMING of the LORD, but in all of them, no distinction is made between the FIRST COMING and the SECOND COMING.
To take just one EXAMPLE let us look at Isaiah 61:1-2. In the synagogue at NAZARETH, JESUS quotes this passage up to the phrase “TO PROCLAIM THE FAVOURABLE YEAR OF THE LORD”. HE then closes the book, and says “Today this scripture has been fulfilled in your hearing.” Luke 4:18-21.
However, in ISAIAH that is not where the passage ends. It ends like this, “AND THE DAY OF VENGEANCE OF OUR GOD.” Isa 61:2. Now this part of the prophecy of Isaiah is yet to be fulfilled at the SECOND COMING OF CHRIST.
PAUL in writing to the THESSALONIANS says concerning the SECOND COMING of CHRIST that HE will be “REVEALED FROM HEAVEN WITH HIS MIGHTY ANGELS IN FLAMING FIRE, DEALING OUT RETRIBUTION TO THOSE WHO DO NOT KNOW GOD AND TO THOSE WHO DO NOT OBEY THE GOSPEL OF OUR LORD JESUS.” 2 THESS 1:7-8.
This merging of the TWO COMINGS is found right throughout the O.T. scriptures, and was the reason for the disciples’ perplexity for, at the MOUNT OF OLIVES, they asked the LORD “IS IT AT THIS TIME YOU ARE RESTORING THE KINGDOM TO ISRAEL?” Acts 1:6. (Also Luke 19:11.)
In their reading of the scriptures, they had found no indication that there were TWO COMINGS of the MESSIAH, separated from each other by some TWO THOUSAND YEARS.