The text of Daniel has been in Hebrew from chapter 1, but now in verse 20 it switches to Aramaic, and it does not switch back to Hebrew until chapter 7. That is why the three Hebrews are called Shadrach, Meshach and Abednego from now on, but Daniel is still called Daniel.
The Apostle Peter is referred to as the rock “Petros” from the time of his confession. Matt 16:16 and Simon Peter answering said, `Thou art the Christ, the Son of the living God.’ 17 And Jesus answering said to him, `Happy art thou, Simon Bar-Jona, because flesh and blood did not reveal [it] to thee, but my Father who is in the heavens. 18 `And I also say to thee, that thou art a rock (Petros), and upon this rock (Petra) I will build my assembly, and gates of Hades shall not prevail against it; 19 and I will give to thee the keys of the reign of the heavens, and whatever thou mayest bind upon the earth shall be having been bound in the heavens, and whatever thou mayest loose upon the earth shall be having been loosed in the heavens.’
Roman Catholics take this verse to mean that Peter is the head of the church, protestants take this verse to point out that it is the confession and the faithful execution of commands according to the heavenly directions given Christ’s followers.
Peter himself seems to indicate the later in 1 Peter: 4 Coming to Him as to a living stone, rejected indeed by men, but chosen by God and precious, 5 you also, as living stones, are being built up a spiritual house, a holy priesthood, to offer up spiritual sacrifices acceptable to God through Jesus Christ. 6 Therefore it is also contained in the Scripture,
“Behold, I lay in Zion
A chief cornerstone, elect, precious,
And he who believes on Him will by no means be put to shame.”
7 Therefore, to you who believe, He is precious; but to those who are disobedient,
“The stone which the builders rejected
Has become the chief cornerstone,”
“A stone of stumbling
And a rock of offense.”[d]
They stumble, being disobedient to the word, to which they also were appointed.
9 But you are a chosen generation, a royal priesthood, a holy nation, His own special people, that you may proclaim the praises of Him who called you out of darkness into His marvelous light; 10 who once were not a people but are now the people of God, who had not obtained mercy but now have obtained mercy.