عَن أبي أَيُّوب قَالَ: كُنَّا عِنْدَ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَقُرِّبَ طَعَامٌ فَلَمْ أَرَ طَعَامًا كَانَ أَعْظَمَ بَرَكَةً مِنْهُ أَوَّلَ مَا أَكَلْنَا وَلَا أَقَلَّ بَرَكَةً فِي آخِرِهِ قُلْنَا: يَا رَسُولَ اللَّهِ كَيْفَ هَذَا؟ قَالَ: «إِنَّا ذَكَرْنَا اسْمَ اللَّهِ عَلَيْهِ حِينَ أَكَلْنَا ثُمَّ قَعَدَ مَنْ أَكَلَ وَلَمْ يُسَمِّ اللَّهَ فَأَكَلَ مَعَهُ الشَّيْطَانُ» . رَوَاهُ فِي شرح السّنة

Ibn ‘Abbas told that when food was presented to the Prophet or, his coming out from the privy and he was asked whether they should bring him water for ablution, he replied, “I have been commanded to perform ablution only when I get up for prayer.” Tirmidhi, Abu Dawud and Nasa’i transmitted it, and Ibn Majah transmitted it on Abu Huraira’s authority.