Sayyiduna Ibn Mas'ud (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) would most often return to his chambers from the left side.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 4384
Hadith Gradingحکم دارالسلام:صحيح، وهذا إسناد حسن من أجل ابن إسحاق.