It is narrated from Sayyiduna Abu Umamah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) was asked about the raised couches, and he (peace and blessings be upon him) said: "If a couch were dropped from the top of them, it would keep falling for a hundred years before it reached the bottom."
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 7916