Bulugh al-Maram 10 Hudud كتاب الحدود 39

وَلِمُسْلِمٍ: عَنْ عَلِيٍّ – رضى الله عنه – -فِي قِصَّةِ اَلْوَلِيدِ بْنِ عَقَبَةَ- { جَلَدَ اَلنَّبِيُّ – صلى الله عليه وسلم -أَرْبَعِينَ, وَأَبُو بَكْرٍ أَرْبَعِينَ, وَعُمَرُ ثَمَانِينَ, وَكُلٌّ سُنَّةٌ, وَهَذَا أَحَبُّ }

Muslim transmitted on the authority of ‘Ali (RAA) concerning the story of al-Walid bin ‘Uqbah that the Messenger of Allah inflicted forty lashes, Abu Bakr (RAA) forty lashes and ‘Umar (RAA) eighty. All of them are in accordance with the Sunnah of the Prophet (صلى الله عليه وسلم) but this one (the eighty lashes) is preferable to me.