بُلُوغُ الْمَرَامِ
Bulugh al-Maram 509
The Book of Prayer
وَلِأَبِي دَاوُدَ: عَنْ أُبَيِّ بْنِ كَعْبٍ: { صَلَّى, فَرَكَعَ خَمْسَ رَكَعَاتٍ وَسَجَدَ سَجْدَتَيْنِ, وَفَعَلَ فِي اَلثَّانِيَةِ مِثْلَ ذَلِكَ } [1] .
Narrated Ubai bin Ka'b (RA): "He [the Prophet (ﷺ)] prayed (the Eclipse prayer) and bowed five times and prostrated twice (in the first Rak'ah), and in the second Rak'a he also did the same." [Abu Dawud]
Sunnah.com reference: Book 2, Hadith 439