This is from the Lost Books of the Bible. Very Interesting, Barnabas interpreting the Old Testament
The GENERAL EPISTLE OF BARNABAS.
[Barnabas was a companion and fellow-preacher with Paul. This Epistle lays a greater claim to canonical authority than most others. It has been cited by Clemens Alexandrinus, Origen, Eusebius, and Jerome, and many ancient Fathers. Cotelerius affirms that Origen and Jerome esteemed it genuine and canonical; but Cotelerius himself did not believe it to be either one or the other; on the contrary, he supposes it was written for the benefit of the Ebionites (the christianized Jews,) who were tenacious of rites and ceremonies. [others, deemed it apocryphal.]
CHAP. X.
Baptism and the Cross of Christ foretold in figures under the law.
LET us now inquire whether the Lord took care to manifest anything beforehand concerning water and the cross.
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Now for the former of these, it is written to the people of Israel how they shall not receive that baptism which brings to forgiveness of sins; but shall institute another to themselves that cannot.
3 For thus saith the prophet: 1 Be astonished, O Heaven! and let the earth tremble at it, because this people have done two great and wicked things; they have left me, the fountain of living water, and have digged for themselves broken cisterns, that can hold no water.
4 Is my holy mountain a 2 Zion, a desolate wilderness? 3 For ye shall be as a young bird when its nest is taken away.
5 And again the prophet saith, 4 I will go before thee, and will make plain the mountains, and will break the gates of brass, and will snap in sunder the bars of iron; and will give thee dark, and hidden, and invisible treasures, that they may know that I am the Lord God.
6 And again: He shall dwell 5 in the high den of the strong rock. And then, what follows in the same prophet? His water is faithful; ye shall see the king with glory, and your soul shall learn the fear of the Lord.
7 And again he saith in another prophet: He that does these things; 1shall be like a tree, planted by the currents of water, which shall give its fruit in its season. Its leaf also shall not wither, and whatsoever he doth it shall prosper.
8 As for the wicked it is not so with them; but they are as the dust which the wind scattereth away from the face of the earth.
9 Therefore the ungodly shall not stand in the judgment, neither the sinners in the council of the righteous. For the Lord knoweth the way of the righteous and the way of the ungodly shall perish.
10 Consider how he has joined both the cross and the water together.
11 For thus he saith: Blessed are they who put their trust in the cross, descend into the water; for they shall have their reward in due time; then, saith he, will I give it them.
12 But as concerning the present time, he saith, their leaves shall not fall; meaning thereby that every word that shall go out of your mouth, shall through faith and charity be to the conversion and hope of many.
13 In like manner doth another prophet speak. 2 And the land of Jacob was the praise of all the earth; 3 magnifying thereby the 4vessel of his spirit.
14 And what follows?—And there was a river running on the right hand, and beautiful trees grew up by it; and he that shall eat of them shall live for ever. The signification of which is this: that we go down into the water full of sins and pollutions; but come up again, bringing forth fruit; having in our hearts the fear and hope which is in Jesus, by the spirit. And whosoever shall eat of them shall live for ever.
15 That is, whosoever shall hearken to those who call them, and shall believe, shall live for ever…
https://sacred-texts.com/bib/lbob/lbob17.htm