Hadith 1156

It was narrated from Qabus that his father said: “My father sent word to ‘Aishah, asking which prayer the Prophet (saw) most liked to perform regularly. She said: ‘He used to perform four Rak’ah before the Zuhr, in which he would stand for a long time and bow and prostrate perfectly.’”

حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا جَرِيرٌ، عَنْ قَابُوسَ، عَنْ أَبِيهِ، قَالَ أَرْسَلَ أَبِي إِلَى عَائِشَةَ أَىُّ صَلاَةِ رَسُولِ اللَّهِ ـ صلى الله عليه وسلم ـ كَانَ أَحَبَّ إِلَيْهِ أَنْ يُوَاظِبَ عَلَيْهَا؟ قَالَتْ: كَانَ يُصَلِّي أَرْبَعًا قَبْلَ الظُّهْرِ. يُطِيلُ فِيهِنَّ الْقِيَامَ، وَيُحْسِنُ فِيهِنَّ الرُّكُوعَ وَالسُّجُودَ ‏.‏

Reference: 1312100
In-book reference: Book 5, Hadith 1156
Hadith 1156 - The Book On The Mosques And The Congregations - Sunan Ibn Majah - Sunnah.com