Step 1:
The statement means:
\[
\text{``What is here may be found elsewhere,}
\]
\[
\text{but what is not here is nowhere else.''}
\]
Step 2:
It emphasizes the vastness and completeness of a text.
Step 3:
This famous declaration is associated with:
\[
\boxed{\text{Mahabharata}}
\]
Step 4:
Hence, the correct option is:
\[
\boxed{\text{(3) Mahabharata}}
\]