Tafsir of Az-Zalzala 99:4

That Day it will declare its information. meaning, it will speak of what the people did upon its surface. Imam Ahmad, At-Tirmidhi and Abu `Abdur-Rahman An-Nasa'i all recorded a Hadith from Abu Hurayrah -- and in the wording of An-Nasa'i's version it states -- that he said, "The Messenger of Allah recited this Ayah,

يوميذ تحدث أخبارها

(That Day it will declare its information.) Then he said, Do you know what is its information? They said, `Allah and His Messenger know best.' He said,

فٳن أخبارها أن تشهد على كل عبد وأمة بما عمل على ظهرها أن تقول عمل كذا وكذا يوم كذا وكذا فهذه أخبارها

Verily, its information is that it will testify against every male and female servant, about what they did upon its surface. It will say that he did such and such on such and such day. So this is its information.'' At-Tirmidhi said, "This Hadith is Sahih Gharib.'' Concerning Allah's statement,

بٲن ربك أوحى لها