Al-Adab Al-Mufrad #349
Visitation
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
حَدَّثَنَا عَلِيُّ بْنُ حُجْرٍ، قَالَ: حَدَّثَنَا صَالِحُ بْنُ عُمَرَ الْوَاسِطِيُّ، عَنْ أَبِي خَلْدَةَ قَالَ: جَاءَ عَبْدُ الْكَرِيمِ أَبُو أُمَيَّةَ إِلَى أَبِي الْعَالِيَةِ، وَعَلَيْهِ ثِيَابُ صُوفٍ، فَقَالَ أَبُو الْعَالِيَةِ: إِنَّمَا هَذِهِ ثِيَابُ الرُّهْبَانِ، إِنْ كَانَ الْمُسْلِمُونَ إِذَا تَزَاوَرُوا تَجَمَّلُوا.
'Abdulkarim Abu Umuyyah came to Abu Al'aliyah and on him were wool clothes. So Abu Al'aliyah said "These are but the clothes of monks, as the Muslims, when visiting each other, would beautify themselves."
About Al-Adab Al-Mufrad
This hadith is #349 from Al-Adab Al-Mufrad, in the Book of Visitation.