So for the Bereans to become Christian, they had to accept the oral testimony of the Church that the person of Jesus Christ had indeed died and rose from the dead. They had no Scripture to 'check' that fact. Which is why it's a very odd example to try to promote as evidence for sola-Scriptura. For if they had been sola-Scriptura, they would have asked Paul where in the Bible it showed that the person of Jesus Christ had fulfilled those prophecies, and when it was not to be found there, they should have rejected it. Rather, they received with great joy the word of God as spoken by the apostles (as did all of those at Pentecost). They accepted the oral testimony of the Church as Truth and became Christians.
There was no need to receive oral tradition. The miracles Jesus did were widely known.
What happened to Jesus on the cross was well known.
Today we would have to check documents to find out what happened, these people already knew what happened.
These men in Luke's Gospel had the advantage of a first hand experience of the Risen Lord. The Bereans did not. They accepted the oral testimony of the Church that the person of Jesus Christ had indeed suffered, died, and risen from the dead. Fortunately they did not require that Truth to be found in Scripture, or they would have by necessity rejected it.
The 2 disciples on the road to Emmaus did not recognize Jesus. His identity was hid from them.
But, they knew the things Jesus had done and Jesus showed them the Scriptures concerning Himself.
These 2 disciples had to see Jesus in the Scriptures by faith, just as the Bereans, just as we do too.
It is also the oral word of God as spoken by the apostles as the Scriptures attest
(
Luke 5:1, And it came to pass, that, as the people pressed upon him to hear the word of God, he stood by the lake of Gennesaret,
Luke 11:28, But he said, Yea rather, blessed
are they that hear the word of God, and keep it.
Acts 4:31, And when they had prayed, the place was shaken where they were assembled together; and they were all filled with the Holy Ghost, and they spake the word of God with boldness.
Acts 13:5, And when they were at Salamis, they preached the word of God in the synagogues of the Jews: and they had also John to
their minister.
Acts 13:46, Then Paul and Barnabas waxed bold, and said, It was necessary that the word of God should first have been spoken to you: but seeing ye put it from you, and judge yourselves unworthy of everlasting life, lo, we turn to the Gentiles.
1 Thessalonian 2:13,
Isaiah 1:10,
Jeremiah 19:3,
Luke 8:12, Those by the way side are they that hear; then cometh the devil, and taketh away the word out of their hearts, lest they should believe and be saved.
Luke 8:21, Now it came to pass on a certain day, that he went into a ship with his disciples: and he said unto them, Let us go over unto the other side of the lake. And they launched forth.
Acts 13:7, Which was with the deputy of the country, Sergius Paulus, a prudent man; who called for Barnabas and Saul, and desired to hear the word of God.
Acts 15:7, And when there had been much disputing, Peter rose up, and said unto them, Men
and brethren, ye know how that a good while ago God made choice among us, that the Gentiles by my mouth should hear the word of the gospel, and believe.
Philippians 1:14, And many of the brethren in the Lord, waxing confident by my bonds, are much more bold to speak the word without fear.
1 Thessalonians 4:15, For this we say unto you by the word of the Lord, that we which are alive
and remain unto the coming of the Lord shall not prevent them which are asleep
Hebrews 13:7, Remember them which have the rule over you, who have spoken unto you the word of God: whose faith follow, considering the end of
their conversation.
2 Kings 23:16, And as Josiah turned himself, he spied the sepulchres that
were there in the mount, and sent, and took the bones out of the sepulchres, and burned
them upon the altar, and polluted it, according to the word of the LORD which the man of God proclaimed, who proclaimed these words.
2 Chronicles 10:15 So the king hearkened not unto the people: for the cause was of God, that the LORD might perform his word, which he spake by the hand of Ahijah the Shilonite to Jeroboam the son of Nebat.
How do any of these verses cited say that what they spoke became the Word of God.
The Word was given to them by God and these people proclaimed it.
It is also the body of believers, the Church as the Scriptures attest
Acts 6:7, And the word of God increased; and the number of the disciples multiplied in Jerusalem greatly; and a great company of the priests were obedient to the faith.
Acts 12:24 But the word of God grew and multiplied.