Okla. Stat. tit. 12, § 1148.16

The summons to be issued in an action for forcible entry and detainer, commonly known as an eviction, shall be in a form developed in plain and understandable language by the Oklahoma Bar Association. The Administrative Office of the Courts shall provide public access to the affidavit by providing a link to the form on the Oklahoma State Courts Network (OSCN) website. The summons shall be delivered no less than three (3) days before the scheduled time and date of the court hearing. This scheduled date and time shall not be less than five (5) days from the date the summons is issued.