I acknowledge that there is no hard and fast rule that a preliminary objection must be supported by an affidavit so long as enough material is placed before the trial court on which it can judicially and judiciously pronounce on the preliminary objection. Where the alleged offending writ, petition or other court process ex facie contains the relevant information against which an objection is being raised, the necessity to rely on affidavit evidence does not arise. See Bello v. National Bank of Nigeria [1992] 6 NWLR (Pt. 246) 206 at 219 (per Achike, JCA, as he then was).
— B.B. Kanyip J. FG v. ASUU (2023) – NICN/ABJ/270/2022