Big Boi Guess Who Saved My Marriage?

6/29/2014 12:10 AM PDT

Big Boi is crediting a carpenter for saving his marriage ... but not just any carpenter.

Our photog got  Big Boi at LAX and congratulated him on reuniting with his wife, Sherlita. The two filed for divorce last year ... but withdrew their legal docs earlier this month.

The rapper tells us ... Jesus brought him and his wife back together ... and he has some advice for other couples in troubled waters.