Abdullah bin Unays reported,

The Messenger of Allah ﷺ said, "I was shown Laylat al-Qadr, then I was made to forget it, but I was shown myself prostrating in water and mud on its morning."He said, "Then it rained on the night of the twenty-third, and the Messenger of Allah ﷺ led us in prayer. When he finished, the traces of water and mud were on his forehead and his nose."He said, Abdullah bin Unays used to say, "It is the twenty-third."

Azami 4672

Sahih

عن عبد الله بن أنيس

أن رسول الله ﷺ قال: أريت ليلة القدر ثم أنسيتها، وأراني صبحها أسجد في ماء وطين. قال: فمطرنا ليلة ثلاث وعشرين، فصلى بنا رسول الله ﷺ، فانصرف وإن أثر الماء والطين على جبهته وأنفه. قال: وكان عبد الله بن أنيس يقول: ثلاث وعشرين.

الأعظمي 4672صحيح
Contents
Reference
Commentary
Ayat
Collection
Jami al-Kamil
Book
Fasting
Chapter
Virtue of Laylat al-Qadr and the striving of the Prophet ﷺ ﷺ in it
Section
Laylat al-Qadr being on the twenty-third night
Numbering
Jami al-Kamil 4672 (2nd edition)
Azami 4672