It wasnarrated that Ibn 'Umar said:
"The Messenger of Allah (ﷺ)usedto pray two Rak'ah before the morning (prayer), as if the Adhanwere in his ears. (i.e., he would pray them briefly). (RU)
English reference (RU): Vol. 1, Book 5, Hadith 1144 (RU)
Arabic reference (RU): Book 5, Hadith 1198 (RU)