Hadith: Allah had written down the destinies of the creatures fifty thousand years before He created the heavens and the earth

عَنْ عَبْدِ اللهِ بْنِ عَمْرِو بْنِ الْعَاصِ، قَالَ: سَمِعْتُ رَسُولَ اللهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ، يَقُولُ: "كَتَبَ اللهُ مَقَادِيرَ الْخَلَائِقِ قَبْلَ أَنْ يَخْلُقَ السَّمَاوَاتِ وَالْأَرْضَ بِخَمْسِينَ أَلْفَ سَنَةٍ، قَالَ: وَعَرْشُهُ عَلَى الْمَاءِ".
[صحيح] - [رواه مسلم]

‘Abdullāh ibn ‘Amr ibn al-‘Ās (may Allah be pleased with him) reported: I heard the Prophet (may Allah’s peace and blessings be upon him) say: "Allah had written down the destinies of the creatures fifty thousand years before He created the heavens and earth. And His Throne is on the water."
Sahih/Authentic. - [Muslim]

Explanation

The Prophet (may Allah’s peace and blessings be upon him) informs in this Hadīth that Allah Almighty had written down the destinies of all creatures in the Preserved Tablet fifty thousand years before creating the heavens and the earth. His statement "and His Throne on the water" is consistent with the verse that says: {And His Throne was upon the water} [Surat Hūd: 7]. Belief in Allah's writing is one of the pillars of faith in the divine decree and predestination, and overall it entails belief in Allah's will and His comprehensive and detailed knowledge of of all things, and that nothing happens whatsoever except according to His will and creation.