Saturday's statement was issued by the leader of Tehreek-e-Taliban Pakistan (TTP), Maulana Fazlullah, sent by his spokesman.
Addressing IS in Syria and Iraq, he said: "We are proud of your conquests against the enemies. We are with you in good and bad times."
"In these troubled days, we call on you to be patient and stay united as your enemies are now united against you. Forget rivalries."
The statement said the global Muslim community would "stand by you in these tough times and help with what we can".
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