The Septuagint was completed nearly three centuries before the birth of Jesus. The Dead Sea Scrolls discovered in 1947 include Book of Isaiah from ca. 125 BC.
The Septuagint (also known as the LXX) is a translation of the Hebrew Bible into the Greek language. The name “Septuagint” comes from the Latin word for seventy. The Septuagint was translated in the third and second centuries B.C. in Alexandria, Egypt.
Here are two often quoted prophetic verses from the Septuagint:
Esaias (Isaiah) 53:5, "But he was wounded on account of our sins, and was bruised because of our iniquities: the chastisement of our peace was upon him; and by his bruises we were healed. 6 All we as sheep have gone astray; every one has gone astray in his way; and the Lord gave him up for our sins."
Michaeas (Micah) 5:2 And thou, Bethleem, house of Ephratha, art few in number to be reckoned among the thousands of Juda; yet out of thee shall one come forth to me, to be a ruler of Israel; and his goings forth were from the beginning, even from eternity.
[Brenton, Sir Lancelot C. L. English Translation of the Greek Septuagint, Including the Apocrypha]
The Great Isaiah Scroll
"The Great Isaiah Scroll (1QIsaa) is one of the original seven Dead Sea Scrolls discovered in Qumran in 1947. It is the largest (734 cm) and best preserved of all the biblical scrolls, and the only one that is almost complete. The 54 columns contain all 66 chapters of the Hebrew version of the biblical Book of Isaiah. Dating from ca. 125 BCE, it is also one of the oldest of the Dead Sea Scrolls, some one thousand years older than the oldest manuscripts of the Hebrew Bible known to us before the scrolls' discovery."
Isaiah 53 at Qumran
"Among the Dead Sea Scrolls found in caves at the village of Qumran overlooking the Dead Sea (Hebrew, Yam haMelach, Salt Sea) were fragments or whole copies of 21 distinct scrolls of the prophet Isaiah. The best known is the Great Isaiah Scroll (designated 1QIsaa), the only complete copy of Isaiah at Qumran, measuring 24 feet long. It was among seven original scrolls found in 1947."
2 Peter 1:19-21, “19 We have also a more sure word of prophecy; whereunto ye do well that ye take heed, as unto a light that shineth in a dark place, until the day dawn, and the day star arise in your hearts: 20 Knowing this first, that no prophecy of the scripture is of any private interpretation. 21 For the prophecy came not in old time by the will of man: but holy men of God spake as they were moved by the Holy Ghost.”
353 Prophecies Fulfilled in Jesus - A good witnessing Tool