Mishkat al-Masabih #321
Purification
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ أَنَسٍ رَضِيَ اللَّهُ عَنْهُ قَالَ: كَانَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِذَا أَرَادَ الْحَاجَةَ لَمْ يَرْفَعْ ثَوْبَهُ حَتَّى يَدْنُوَ مِنَ الأَرْض. رَوَاهُ التِّرْمِذِيّ وَأَبُو دَاوُد والدارمي
Anas said that when the Prophet wanted to relieve himself he did not raise his garment till he was near the ground.
Tirmidhi, Abu Dawud and Darimi transmitted it.
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About Mishkat al-Masabih
This hadith is #321 from Mishkat al-Masabih, in the Book of Purification.