Sahih al-bukhari:6303 Chapter: How the Salam began Book 79, Hadith 75

Narrated `Amr: Ibn `Umar said, “By Allah, I have not put a brick over a brick (i.e. constructed a building) or planted
any date-palm tree since the death of the Prophet.” Sufyan (the sub narrator) said, “I told this narration
(of Ibn `Umar) to one of his (Ibn `Umar’s) relatives, and he said, ‘By Allah, he did build (something.’
“Sufyan added, “I said, ‘He must have said (the above narration) before he built.”