Narrated Salman al-Farsi:

I read in the Torah that the blessing of food consists in ablution before it. So I mentioned it to the Prophet ﷺ. He said: The blessing of food consists in ablution before it and ablution after it.

Sufyan disapproved of performing ablution before taking food.

Abu Dawud said: It is weak.

حَدَّثَنَا مُوسَى بْنُ إِسْمَاعِيلَ، حَدَّثَنَا قَيْسٌ، عَنْ أَبِي هَاشِمٍ، عَنْ زَاذَانَ، عَنْ سَلْمَانَ، قَالَ قَرَأْتُ فِي التَّوْرَاةِ أَنَّ بَرَكَةَ الطَّعَامِ الْوُضُوءُ قَبْلَهُ فَذَكَرْتُ ذَلِكَ لِلنَّبِيِّ ﷺ فَقَالَ
" بَرَكَةُ الطَّعَامِ الْوُضُوءُ قَبْلَهُ وَالْوُضُوءُ بَعْدَهُ " . وَكَانَ سُفْيَانُ يَكْرَهُ الْوُضُوءَ قَبْلَ الطَّعَامِ . قَالَ أَبُو دَاوُدَ وَهُوَ ضَعِيفٌ .