Sayyiduna al-Mughirah bin Shu'bah (may Allah be pleased with him) narrated: I was with the Messenger of Allah (peace and blessings be upon him) on a journey, and when he (peace and blessings be upon him) went (to relieve himself), he would go far away.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 443