حَدَّثَنَا أَحْمَدُ بْنُ عَبْدَةَ، أَنْبَأَنَا حَمَّادُ بْنُ زَيْدٍ، عَنْ أَنَسِ بْنِ سِيرِينَ، عَنِ ابْنِ عُمَرَ، قَالَ كَانَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ يُصَلِّي الرَّكْعَتَيْنِ قَبْلَ الْغَدَاةِ كَأَنَّ الأَذَانَ بِأُذُنَيْهِ ‏.‏

It wasnarrated that Ibn ‘Umar said: “The Messenger of Allah (PBUH)usedto pray two Rak’ah before the morning (prayer), as if the Adhanwere in his ears. (i.e., he would pray them briefly). Translation Not Available

Book Ref: Sunan Ibn Majah Book 5 Hadith 1144
Web Ref:  Sunan Ibn Majah Vol 1 Book 5 Hadith 1144