بُلُوغُ الْمَرَامِ
Bulugh al-Maram 400
The Book of Prayer
وَكَذَا لِلْبُخَارِيِّ: عَنْ أَبِي سَعِيدٍ, وَقَالَ: دَرَجَةً [1] .
Likewise, al-Bukhari reported from Abu Sa'id al-Khudri: "He (ﷺ) said (the word) Daraja (degree)."
Sunnah.com reference: Book 2, Hadith 304