During a solar eclipse the Prophet (sallallahu alayhi wa sallam) gave command that slaves should be set free.
وَعَنْ أَسْمَاءَ بِنْتِ أَبِي بَكْرٍ رَضِيَ اللَّهُ عَنْهُمَا
قَالَتْ: لَقَدْ أَمَرَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ بِالْعَتَاقَةِ فِي كُسُوفِ الشَّمْسِ
During a solar eclipse the Prophet (sallallahu alayhi wa sallam) gave command that slaves should be set free.
Who passed it on, from Al-Khatib at-Tibrizi back to the one who was there.
The same words, in another collection.
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