صحيح البخاري Sahih Bukhari كتاب الكسوف The Book of The Eclipses.
بَابُ قَوْلِ الإِمَامِ فِي خُطْبَةِ الْكُسُوفِ أَمَّا بَعْدُ:

(16) Chapter. The saying of Imam Amma ba‘du (then after), during the Khutba of the eclipse.

1 hadith
Hadith 1061
وَقَالَ أَبُو أُسَامَةَ ، حَدَّثَنَا هِشَامٌ ، قَالَ : أَخْبَرَتْنِي فَاطِمَةُ بِنْتُ الْمُنْذِرِ ، عَنْ أَسْمَاءَ ، قَالَتْ : فَانْصَرَفَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ وَقَدْ تَجَلَّتِ الشَّمْسُ فَخَطَبَ فَحَمِدَ اللَّهَ بِمَا هُوَ أَهْلُهُ ثُمَّ قَالَ أَمَّا بَعْدُ
And this was narrated by Asma' who said, "Allah's Messenger (saws) finished the eclipse prayer and by then the sun (eclipse) had cleared. Then he delivered the Khutba (religious talk) and praised Allah as He deserved and then said Amma ba'du."
Hadith Reference Sahih Bukhari / The Book of The Eclipses. / Hadith: 1061
Hadith Grading محدثین: أحاديث صحيح البخاريّ كلّها صحيحة