From Sahih Bukhari (Hadith 6049):
Narrated 'Ubada bin As-Samit:Allah's Messenger (ﷺ) went out to inform the people about the (date of the Night of decree (Al-Qadr). There happened a quarrel between two Muslim men. The Prophet (ﷺ) said, "I came out to inform you about the Night of Al-Qadr, but as so-and-so and so-and-so quarrelled, so the news about it had been taken away; and may be it was better for you. So look for it in the ninth, the seventh, or the fifth (of the last ten days of Ramadan)
Reference: Bukhari 6049