Hadith: Do you know what your Lord has said?" They replied: "Allah and His Messenger know best." He said: "He has said: 'Some of My servants have entered the morning as believers in Me and some as disbelievers

عَنْ زَيْدِ بْنِ خَالِدٍ الجُهَنِيِّ رضي الله عنه أَنَّهُ قَالَ:
صَلَّى لَنَا رَسُولُ اللهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ صَلَاةَ الصُّبْحِ بِالْحُدَيْبِيَةِ عَلَى إِثْرِ سَمَاءٍ كَانَتْ مِنَ اللَّيْلَةِ، فَلَمَّا انْصَرَفَ أَقْبَلَ عَلَى النَّاسِ، فَقَالَ: «هَلْ تَدْرُونَ مَاذَا قَالَ رَبُّكُمْ؟» قَالُوا: اللهُ وَرَسُولُهُ أَعْلَمُ، قَالَ: «أَصْبَحَ مِنْ عِبَادِي مُؤْمِنٌ بِي وَكَافِرٌ، فَأَمَّا مَنْ قَالَ: مُطِرْنَا بِفَضْلِ اللهِ وَرَحْمَتِهِ، فَذَلِكَ مُؤْمِنٌ بِي وَكَافِرٌ بِالْكَوْكَبِ، وَأَمَّا مَنْ قَالَ: بِنَوْءِ كَذَا وَكَذَا، فَذَلِكَ كَافِرٌ بِي وَمُؤْمِنٌ بِالْكَوْكَبِ».
[صحيح] - [متفق عليه] - [صحيح البخاري: 846]

Zayd ibn Khālid al-Juhani (may Allah be pleased with him) reported:
The Messenger of Allah (may Allah’s peace and blessings be upon him) led us in the Fajr prayer at Al-Hudaybiyah after rainfall during the night. At the conclusion of the prayer, he turned toward the people and said: "Do you know what your Lord has said?" They replied: "Allah and His Messenger know best." He said: "He has said: 'Some of My servants have entered the morning as believers in Me and some as disbelievers. He who says, 'We have had rainfall by the grace and mercy of Allah' believes in Me and disbelieves in the stars, and he who says, 'We have had rainfall by the rising of such and such star' disbelieves in Me and believes in the stars.'"
[Authentic hadith] - [Narrated by Bukhari & Muslim] - [Sahih Bukhari - 846]

Explanation

The Prophet (may Allah's peace and blessings be upon him) offered the Fajr prayer in Al-Hudaybiyah, a village close to Makkah, after rainfall at night. After he made taslīm and finished the prayer, he turned towards the people and asked them: Do you know what your Almighty Lord has said? They replied: Allah and His Messenger know best. He said: Allah Almighty clarified that people fall under two categories upon rainfall: believers in Allah Almighty and disbelievers in Him. Those who say, "We have had rainfall out of Allah's bounty and mercy," ascribing the rainfall to Allah, are believers in Allah, the Creator, and the Disposer of the affairs of the universe, and they disbelieve in the stars. And those who say, "We have had rainfall due to such and such star," are disbelievers in Allah and believers in the stars. But this is minor disbelief, as they attribute rainfall to a star, while Allah did not make it a cause of rainfall, neither in terms of the Shariah nor in terms of destiny. But as for those who ascribe rainfall and other earthly occurrences to the rise and decline of the stars, believing that they are the actual doer, they have fallen into major disbelief.