Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) said: "The millstone of Islam will turn at the head of the thirty-fifth year, then a tremendous event will occur. If their destruction lies in it, then that was bound to happen; otherwise they will be granted a respite for seventy years. Whoever lives to see that time will see things he dislikes."
Imam al-Tabarani (may Allah have mercy on him) said: Abu al-Ahwas narrated it mawquf (as the saying of Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) himself), whereas Masruq, Abd al-Rahman bin Abdullah and al-Bara' bin Najiyah narrated it marfu' (as the saying of the Prophet (peace and blessings be upon him)).
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 9127