I and 'Abd Allah b. Yasar, the freed slave of Maimunah, wife of the Prophet ﷺ, came and entered upon Abu al-Juhaim b. al-Harith b. al-Simmat al-Ansari. Abu al-Juhaim said: The Messenger of Allah ﷺ came from Bir Jamal (a place near Medina) and a man met him and saluted him. The Messenger of Allah ﷺ did not return the salutation until he came to a wall and wiped his face and hands and then returned the salutation (i.e. after performing tayammum).  

أَنَّهُ سَمِعَهُ يَقُولُ أَقْبَلْتُ أَنَا وَعَبْدُ اللَّهِ بْنُ يَسَارٍ مَوْلَى مَيْمُونَةَ زَوْجِ النَّبِيِّ ﷺ حَتَّى دَخَلْنَا عَلَى أَبِي الْجُهَيْمِ بْنِ الْحَارِثِ بْنِ الصِّمَّةِ الأَنْصَارِيِّ فَقَالَ أَبُو الْجُهَيْمِ أَقْبَلَ رَسُولُ اللَّهِ ﷺ مِنْ نَحْوِ بِئْرِ جَمَلٍ فَلَقِيَهُ رَجُلٌ فَسَلَّمَ عَلَيْهِ فَلَمْ يَرُدَّ رَسُولُ اللَّهِ ﷺ عَلَيْهِ السَّلاَمَ حَتَّى أَتَى عَلَى جِدَارٍ فَمَسَحَ بِوَجْهِهِ وَيَدَيْهِ ثُمَّ رَدَّ عَلَيْهِ السَّلاَمَ  

Accompanied by 'Abd Allah b. 'Umar, I went to Ibn 'Abbas for a certain work. He (Ibn 'Abbas) narrated a tradition saying: A man passed by the Messenger of Allah ﷺ in a street, while he returned from the toilet or just urinated. He (the man) saluted him, but the Prophet did not return the salutation. When the man was about to disappear (from sight) in the street he struck the wall with both his hands and wiped his face with them. He then struck another stroke and wipes his arms. He then returned the man's salutation. Then he said: I did not return the salutation to you because I was not purified. Abu Dawud said: I heard Ahmad b. Hanbal say: Muhammad b. Thabit reported a rejected tradition. Ibn Dasah said: Abu Dawud said: No one supported Muhammad b. Thabit in respect of narrating this tradition as to striking the wall twice (for wiping) from the Prophet ﷺ, but reported it as an action of Ibn 'Umar.  

أَنْ قَالَ مَرَّ رَجُلٌ عَلَى رَسُولِ اللَّهِ ﷺ فِي سِكَّةٍ مِنَ السِّكَكِ وَقَدْ خَرَجَ مِنْ غَائِطٍ أَوْ بَوْلٍ فَسَلَّمَ عَلَيْهِ فَلَمْ يَرُدَّ عَلَيْهِ حَتَّى إِذَا كَادَ الرَّجُلُ أَنْ يَتَوَارَى فِي السِّكَّةِ ضَرَبَ بِيَدَيْهِ عَلَى الْحَائِطِ وَمَسَحَ بِهِمَا وَجْهَهُ ثُمَّ ضَرَبَ ضَرْبَةً أُخْرَى فَمَسَحَ ذِرَاعَيْهِ ثُمَّ رَدَّ عَلَى الرَّجُلِ السَّلاَمَ وَقَالَ إِنَّهُ لَمْ يَمْنَعْنِي أَنْ أَرُدَّ عَلَيْكَ السَّلاَمَ إِلاَّ أَنِّي لَمْ أَكُنْ عَلَى طُهْرٍ  

The Messenger of Allah ﷺ came from the privy. A man met him near Bir Jamal and saluted him. The Messenger of Allah ﷺ did not return the salutation until he came to a wall and placed his hands on the wall and wiped his face and hands; he then returned the man's salutation.  

أَقْبَلَ رَسُولُ اللَّهِ ﷺ مِنَ الْغَائِطِ فَلَقِيَهُ رَجُلٌ عِنْدَ بِئْرِ جَمَلٍ فَسَلَّمَ عَلَيْهِ فَلَمْ يَرُدَّ عَلَيْهِ رَسُولُ اللَّهِ ﷺ حَتَّى أَقْبَلَ عَلَى الْحَائِطِ فَوَضَعَ يَدَهُ عَلَى الْحَائِطِ ثُمَّ مَسَحَ وَجْهَهُ وَيَدَيْهِ ثُمَّ رَدَّ رَسُولُ اللَّهِ ﷺ عَلَى الرَّجُلِ السَّلاَمَ