(3) باب مَا يُسْتَحَبُّ مِنَ الْعَتَاقَةِ فِي الْكُسُوفِ وَالآيَاتِ
Narrated Asma' bint Abu Bakr:
We were ordered to free slaves at the time of lunar eclipses.
Reference: Sahih al-Bukhari 2520
In-book reference: Book 49, Hadith 4
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 3, Book 46, Hadith 696