It was narrated that Abu 'Aqrab al-Asadi said:

I went to 'Abdullah bin Mas'ood one morning and I found him sitting on his roof and I heard him saying: Allah and His Messenger spoke the truth. I climbed up to him and said: O Abu ‘Abdur-Rahman, why did you say, Allah and His Messenger spoke the truth, Allah and His Messenger spoke the truth? He said: Verily the Messenger of Allah (ﷺ) told us that Lailatal-Qadr is halfway through the last seven nights of Ramadan, and on that morning the sun rises clear, with no rays. I climbed up and looked at it and I said: Allah and His Messenger spoke the truth, Allah and His Messenger spoke the truth.