For those who are curios, the psalm written is psalm 46. (It also contains the end of psalm 45.)

Here it is: (I will highlight what’s written on the manuscript leaf.)

In finem, filiis Core, pro arcanis. Psalmus.
1  Deus noster refugium et virtus ;
adjutor in tribulationibus quæ invenerunt nosnimis.
2  Propterea non timebimus dum turbabitur terra,
et transferentur montes in cor maris.
3  Sonuerunt, et turbatæ sunt aquæ eorum ;
conturbati sunt montes in fortitudine ejus.
4  Fluminis impetus lætificat civitatem Dei :_
sanctificavit tabernaculum suum Altissimus.
5 Deus in medio ejus, non commovebitur ;
adjuvabit eam Deus mane diluculo.
6 Conturbatæ sunt gentes, et inclinata sunt regna :
dedit vocem suam, mota est terra.
7  Dominus virtutum nobiscum ;
susceptor noster Deus Jacob.
8  Venite, et videte opera Domini,
quæ posuit prodigia super terram,
9  auferens bella usque ad finem terræ.
Arcum conteret, et confringet arma,
et scuta comburet igni.
10  Vacate, et videte quoniam ego sum Deus ;
exaltabor in gentibus, et exaltabor in terra.
11  Dominus virtutum nobiscum ;
susceptor noster Deus Jacob.

Here’s the translation:

Unto the end, for the sons of Core, for the hidden things. A psalm.
1  God is our hope and strength:
a very present help in trouble.
2  Therefore will we not fear, though the earth be moved:
and though the hills be carried into the midst of the sea;
3  Though the waters thereof rage and swell:
and though the mountains shake at the tempest of the same.
4  The rivers of the flood thereof shall make glad the city of God:
the holy place of the tabernacle of the most Highest.
5  God is in the midst of her, therefore shall she not be removed:
God shall help her, and that right early.
6  The heathen make much ado, and the kingdoms are moved:
but God hath shewed his voice, and the earth shall melt away.
7  The Lord of hosts is with us:
the God of Jacob is our refuge.
8  O come hither, and behold the works of the Lord:
what destruction he hath brought upon the earth.
9  He maketh wars to cease in all the world:
he breaketh the bow, and knappeth the spear in sunder,
and burneth the chariots in the fire.
10  Be still then, and know that I am God:
I will be exalted among the heathen, and I will be exalted in the earth.
11  The Lord of hosts is with us:
the God of Jacob is our refuge.

I found myself being almost as excited as you were! Congratulations!!

I see insect damage at 7:24 where the grub has eaten the surface, four U shaped gullies. Don't leave it out on a damp castle window. You are very lucky and so is it, it was made to be in the hands that will be inspired, so it is still doing its job 700 years later. What a beautiful piece, weird material when you held it up to the light.

Nothing compares to holding a piece of history in your hands

First video I'm watching on the channel.
I couldn't resist.
I feel, with this title, a "scent" of "The Name of The Rose", and I loved it.

This is absolutely amazing, congratulations! That's insanely skilfully crafted and I can't think of a single person more befitting to care for it!

Second time watching this. how awesome. thanks for posting

Years ago I had the opportunity to hold and leaf through a "book of hours" from the 14th century in an antiquarian bookshop in Hildesheim. I found that very impressive! I can understand the fascination very well...

This is incredible! I'm sitting here picturing what the person who wrote that looked like and their daily life because I'm weird, but like how can you not! You're holding this creation in your hands from over 700 years ago and just holy crap. Wow- just wow. My hands would be shaking sooo bad if I tried to touch it lol

The lower case "a" is very interesting. I had not seen one like that - with the horizontal cross line - in the Gothic style before

The film "Water World" (Kevin Costner) is also a good examplo of how a piece of paper could be so important and value due to it's age and autenticity.

Likely the image is King Izas Manu of Edessa because of the long hair.
The page is gorgeous! Love it!

Talk about a treasure!  Your priorities make me happy, Maydi — as does your delightment in this video.

THIS IS SO EXCITING!!!!!! oH my gosh when you were opening it and smiling at the packaging I was right there with you

Your excitement is so infectious! Was mesmerised by the piece, such beauty!

This is so cool! for some reason I didnt even consider the option that these could be something availible to purchase. Well now I have money to save and research to do thank you  😁

Wonderful! The joy on your face and in your voice speaks volumes about your regard for this treasure. As a fellow medievalist I am also over the moon! Love your channel, I’d like to hear your view on gothic cursive script, it’s one I’d like to learn but I’m having a hard time finding information or exemplars.

So cool! I loved to see that. Thank you very much for sharing!!

What an incredible piece of art work and history to have!!  Congratulations on your acquisition, it is magnificent!!!!!! I am new to manuscript illumination, so learned a lot as well.  Thank you for sharing.

absolutely amazing 😲