Providing gospel, I will need two parts of the Bible (2,5)
I believe the answer is:
in truth
'need two parts of the bible' is the definition.
I can't judge whether this definition defines the answer.
'providing gospel i' is the wordplay.
I cannot quite see how this works, but
'gospel' could be 'truth' (I've seen this in another clue) and 'truth' is found in the answer.
'i' is present in the answer.
A single letter 'n' remains which might be clued in a way I don't see.
This explanation may well be incorrect...
'will' acts as a link.
Can you help me to learn more?
(Other definitions for in truth that I've seen before include "To be honest" , "Really" , "As a matter of fact" , "Honestly" , "Actually" .)