It is kinda weird, but you need to pay Oldrak 1,000 gold coins to perform a reset on your quest status which will allow you to collect the Holy Tible again in the place where you got it before.
Find Oldrak here: https://tibia.fandom.com/wiki/Mapper?coords=128.47-126.6-6-2-1-1
I don't know why he cannot sell a new one to you anyway.
Source:
If you need a new one, Oldrak will reset your Tible quest flag for 1,000 gp allowing you to obtain it again. The book is found near the Knightwatch Tower (here).
https://tibia.fandom.com/wiki/The_Holy_Tible
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