From Fox News:

“I pledge allegiance to [omitted] may God protect him [in Arabic], on behalf of [omitted],” Mateen told the dispatcher.

Assistant Special Agent in Charge Ron Hopper defended the deletions.

“[Mateen] does not represent the religion of Islam, but a perverted view,” Hopper said, later adding: “Part of the redacting is meant to not give credence to individuals who have done terrorist attacks in the past. We’re not gonna propagate their violent rhetoric.”