I was taught that there were 4 holy books revealed by the Almighty. The holy Quran, the Injeel, The Thaurath and the Zaboor. We know what happened to the people of Injeel and Taurath. What happened to the people of Zaboor? Do they still exist?
They are the same as people of the tawrath and Enjeel. As Zaboor was revealed to the Prophet David/Dawod (Peace be upon him) as we can read in different Verses of the Qur'an:
I would recommend you to read also for example the translation of Muhsin Khan for those Verses!
and Zabur is what Christians and Jews call Psalms!
Note that beside the Zabur the Qur'an also tell us about the scriptures of Ibrahim/Abraham (Peace be upon him):
Which are indicated in
and clearly quoted:
Feel free to read more about it here
And Allah knows best!