4-66 (The compiler of the book narrated) that his father - may God be pleased with him - narrated that Sa’ed ibn Abdullah quoted Muhammad ibn al-Hussein ibn Abil Khat’tab, on the authority of Uthman ibn Isa, on the authority of Khalid ibn Najih, on the authority of one of the Immaculate Imams (MGB)
“The Earth will never be void of four groups of believers. Sometimes there will be more than that but it will never be less just as a tent would not stay upright without four ropes and a middle pillar.”