Ibn 'Umar (May Allah be pleased with them) reported:
The Prophet ﷺ as saying: "The worst of lies is to pretend to have seen something which he has not seen."

[Al-Bukhari].

وعن ابن عمر رضي الله عنهما قال: قال النبي ﷺ : "أفرى الفرى أن يري الرجل عينيه ما لم تريا" ((رواه البخاري)) ومعناه يقول: رأيت فيما لم يره.