What is the difference between the sadiqeen and the sidiqeen? why does Allah sometimes use one instead of the other?
The sadiqin means the truthful ones and the siddiqin means the all-truthful ones, an intensive form of sadiqin. One is sometimes used instead of the other in the Qur’an depending on context with regard to subject-matter as well as tone and style.
Hajj Gibril Haddad