(40) باب فَضْلِ لَيْلَةِ الْقَدْرِ وَالْحَثِّ عَلَى طَلَبِهَا وَبَيَانِ مَحَلِّهَا وَأَرْجَى أَوْقَاتِ طَلَبِهَا
This hadith has been reported on the authority of Yahya b. Abu Kathir with the same chain of transmitters (with a slight variation of these words):
I saw the Messenger of Allah (ﷺ) after he had completed (the prayer) and there was a trace of clay on his forehead and tip (of the nose).
Reference: Sahih Muslim 1167 e
In-book reference: Book 13, Hadith 279
USC-MSA web (English) reference(deprecated numbering scheme): Book 6, Hadith 2629