Lil Reese was recently sentenced to five years in a Texas prison for assaulting a family member.
The Chicago rapper will be doing his time with a new faith.
"I DID SOMETHING I BEEN WANTING TO DO FOR SOME YEARS. I FINALLY TOOK MY SHAHADAH DURING RAMADAM," he typed. "THANK YOU ALLAH."
Reese isn't the only jailed Chicago rapper practicing Islam.
His boy Lil Durk, who is facing federal murder for hire charges, is also a Muslim convert.