The letter to the Hebrews shows us the New Testament writers understood YAHSHUA was speaking in many Psalms. Let’s look at some examples. The writer of Hebrews explains some Psalm passages simply by saying “He says” as if it is expected that we understand Who is actually speaking in the Psalms.
5 For to which of the angels did He(YAH) say at any time,
“You are My Son.
Today I have become Your Father?” Psalm 2:7
“I will be to Him(YAHSHUA) a Father(YAH),
and He will be to Me a Son?”
6 When He again brings in the Firstborn into the world He(YAH) says, “Let all the angels of Elohiym worship Him(YAHSHUA).”
7 Of the angels He(YAH) says,
“Who makes His angels winds,
and His servants a flame of fire.” Psalm 104:4
8 But of the Son(YAHSHUA) He(YAH) says,
“Your throne, O Elohiym(YAHSHUA), is forever and ever.
The scepter of uprightness is the scepter of Your Kingdom.
9 You have loved righteousness, and hated iniquity;
therefore Elohiym(YAHSHUA), Your Elohiym(YAH), has anointed(Mahsach) You(YAHSHUA) with the oil of gladness above Your fellows.” Psalm 45:6-7
“You, Adonai(YAHSHUA), in the beginning, laid the foundation of the earth.
The heavens are the works of Your hands.
11 They will perish, but You continue.
They all will grow old like a garment does.
12 You will roll them up like a mantle,
and they will be changed;
but You are the same.
Your years will not fail.” Psalm 102:25-27
13 But which of the angels has He(YAH) told at any time,
“Sit at My right hand,
until I make Your(YAHSHUA) enemies the footstool of Your feet?” Psalm 110:1
14 Aren’t they all serving spirits, sent out to do service for the sake of those who will inherit salvation?
This shows us that the writer of Hebrews understands that it is YAH the Father and YAHSHUA speaking in Psalms. It is left to us to discover Who is speaking to Whom in the various Psalms. We are given clear examples to show us that the Psalms are mostly communications between Son YAHSHUA and Father YAH and the Holy Spirit. Most of the Psalms are YAHSHUA speaking to YAH but He also quotes YAH at times telling us what was said to Him. It is beautiful beyond belief and shows the truth of Scripture revealing to us Their relationship to Each Other.
Here is another in Hebrews 2:
5 For He didn’t subject the world to come, of which we speak, to angels. 6 But One has somewhere testified, saying,
“What is man, that you think of him?
Or the Son of man, that You care for Him?
7 You made Him(YAHSHUA) a little lower than the angels.
You crowned Him with glory and honor,
and set Him over the works of Your hands.
8 You have put all things in subjection under His(YAHSHUA) feet.” Psalm 8:4-6
For in that He(YAH) subjected all things to Him(YAHSHUA), He left nothing that is not subject to Him. But now we don’t see all things subjected to Him, yet. 9 But we see Him(YAHSHUA) Who has been made a little lower than the angels, YAHSHUA, because of the suffering of death crowned with glory and honor, that by the grace of Elohiym He should taste of death for everyone.
This passage in Hebrews shows us that Psalm 8 is the Holy Spirit speaking to YAH about YAHSHUA. Now how amazing is that?
Here is some more continuing in Hebrews 2
10 For it became Him, for Whom are all things, and through Whom are all things, in bringing many children to glory, to make the Author of their salvation(YAHSHUA) perfect through sufferings. 11 For both He Who sanctifies and those who are sanctified are all from One, for which cause He(YAHSHUA) is not ashamed to call them brothers, 12 saying,
“I(YAHSHUA) will declare Your Name(YAH) to My brothers.
Among the congregation I(YAHSHUA) will sing Your(YAH) praise.” Psalm 22:22
This is a quote from Psalm 22 which almost every believer agrees is YAHSHUA speaking during His suffering on the Cross and after. We are told that He is speaking all the way through Psalm 22 by this verse being attributed to Him in Hebrews. Think of what that can teach us. We can know the mind of YAHSHUA and what He went through for us and how He cares about us through His prayers in the Psalms.