The Meaning of "Indeed, among the greatest lies..." in the Hadith

Question:
(The meaning of) "Indeed, among the greatest lies (is one who shows his eyes what they did not see)"?

Answer:
Among the greatest lies is for a person to show what he did not see, saying: "I saw such and such, I saw such and such," or to lie about Allah (Mighty and Majestic), or to lie about His Messenger (peace and blessings be upon him); so it is obligatory for the believer to seek truthfulness in his dreams and in his speech, all of it.