The Book of Legal Punishments
حَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، وَمُحَمَّدُ بْنُ بَشَّارٍ، قَالاَ حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ، حَدَّثَنَا شُعْبَةُ، قَالَ سَمِعْتُ قَتَادَةَ، يُحَدِّثُ عَنْ أَنَسِ بْنِ مَالِكٍ، أَنَّ النَّبِيَّ صلى الله عليه وسلم أُتِيَ بِرَجُلٍ قَدْ شَرِبَ الْخَمْرَ فَجَلَدَهُ بِجَرِيدَتَيْنِ نَحْوَ أَرْبَعِينَ . قَالَ وَفَعَلَهُ أَبُو بَكْرٍ فَلَمَّا كَانَ عُمَرُ اسْتَشَارَ النَّاسَ فَقَالَ عَبْدُ الرَّحْمَنِ أَخَفَّ الْحُدُودِ ثَمَانِينَ . فَأَمَرَ بِهِ عُمَرُ .Anas b. Malik reported that a person who had drink wine was brought to Allah's Apostle (ﷺ). He gave him forty stripes with two lashes. Abu Bakr also did that, but when Umar (assumed the responsibilities) of the Caliphate, he consulted people and Abd al-Rahman said:The mildest punishment (for drinking) is eighty (stripes) and 'Umar their prescribed this punishment
From Sahih Muslim, whose reports the scholars accept as authentic.