The Messenger of Allah ﷺ said, "One bed is for the man, one bed is for his wife, one bed is for the guest, and the fourth is for Satan."
حدثنا أبو عبد الرحمن عبد الله بن يزيد أخبرنا حيوة أخبرني أبو هانئ أنه سمع أبا عبد الرحمن الحبلي يقول إن
قال رسول الله ﷺ فراش للرجل وفراش للمرأة وفراش للضيف والرابع للشيطان
Its isnad is sahih. Abu Hani is Humayd bin Hani Khawlani Misri, and he is trustworthy, his hadith is in Muslim. Abu Abdul-Rahman Hubli is Abdullah bin Yazid Ma'afiri, and he is also trustworthy. The hadith has preceded at 14056.