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]. (ES)
App reference (ES): Book 18, Hadith 35 (ES)
Arabic/English book reference (ES): Book 18, Hadith 1545 (ES)