ENOfficial
Abi Sa'id al-Khudri said (may Allah the Exalted be well pleased with him): "The Prophet (Allah bless him and give him peace) would perform the mid-morning ritual prayer so often that we would say: “He does not omit it,” and he would omit it so often that we would say: “He does not perform it!”
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا زِيَادُ بْنُ أَيُّوبَ الْبَغْدَادِيُّ، قَالَ: حَدَّثَنَا مُحَمَّدُ بْنُ رَبِيعَةَ، عَنْ فُضَيْلِ بْنِ مَرْزُوقٍ، عَنْ عَطِيَّةَ، عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ، قَالَ: كَانَ النَّبِيُّ صلى الله عليه وسلم، يُصَلِّي الضُّحَى حَتَّى نَقُولَ: لا يَدَعُهَا، وَيَدَعُهَا حَتَّى نَقُولَ: لا يُصَلِّيهَا.
sunnah.com