This hadith has been transmitted on the authority of Abu Bakr b. Abu Musa b. Qais who, on the authority of his father, reported the Apostle ﷺ to have said that there would be a tent made of a pearl whose height towards the sky would be sixty miles. In each corner, there would be a family of the believer, out of sight for the others. (Using translation from Muslim 2838c)   

قَالَ رَسُولُ اللَّهِ ﷺ «الْخَيْمَةُ دُرَّةٌ مُجَوَّفَةٌ طُولُهَا فِي السَّمَاءِ سِتُّونَ مِيلًا فِي كُلِّ زَاوِيَةٍ مِنْهَا أَهْلٌ لِلْمُؤْمِنِ لَا يَرَاهُمُ الْآخَرُونَ»