It is the generally accepted practice that tenancy agreement is made in writing. In order to play safe, I do not want to say that it is invariably made in writing; but I can say that it is mostly made in writing. Accordingly, where a party alleges the existence of an oral agreement, which is a unique method and procedure, he must give credible evidence as to the modalities of such agreement. In other words, a party alleging an oral agreement is duty bound to prove such an agreement to the hilt.
– Tobi JSC. Odutola v. Papersack (2007)