Abdullah bin Masud reported,
The Prophet ﷺ said, "Allah will gather the first and the last for the appointed time of a known day, forty years, their eyes fixed upon the sky awaiting the verdict to be passed. And Allah will descend in shades of clouds from the Throne to the Footstool." The hadith continues at length.
Azami 289
Hasanعن عبد الله بن مسعود
عن النبي ﷺ قال: يجمع الله الأولين والآخرين لميقات يوم معلوم أربعين سنة شاخصة أبصارهم إلى السماء ينتظرون فضل القضاء، وينزل الله في ظلل من الغمام من العرش إلى الكرسي. الحديث بطوله.
Ibn Manda reported it in Tawhid (531) through several routes from Ismail bin Ubayd bin Abu Karima, who said, Muhammad bin Salama told us, from Abu Abdul-Rahim Khalid bin Abu Yazid, from Zayd bin Abu Unaysa, from Minhal bin Amr, from Abu Ubayda, from Masruq bin Ajda, from Abdullah bin Masud, and he related the hadith in full. Its chain is hasan, and Dhahabi also graded it hasan in Uluw (200). See the detailed sourcing in Believers Seeing Their Lord on the Day of Resurrection.