Then bring your Book, if you are truthful.
Show us your book, if you are truthful.
Bring your Book, if what you say is true
Then bring your Book, if you are truthful
So come/bring with your Book if you were truthful
Bring your book [the book in which it is written God has begotten children] as a proof if you are not a bunch of liars
“Then bring forth your Book, if you are truthful!”
Then produce your book, if you are truthful
Produce your book if you are truthful
If so then come out with your (authoritative) scripture if you are truthful
Then bring your Book if you are truthful