It was narrated that Anas said:

"The Messenger of Allah said, at the time of Sahur. 'O Anas, I want to fast, so give me something to eat.' So I brought him some dates and a vessel of water. That was after the Adhan of Bilal. He said: 'O Anas, find a man to come and eat with me.' So I called Zaid bin Thabit, who came and said: "I drank some Sawiq and I want to fast.' The Messenger of Allah said: "I also want to fast.' So he ate Sahr with him, then he got up and prayed two Rak'ahs, then he went out to the prayer."

أَخْبَرَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ، قَالَ أَنْبَأَنَا عَبْدُ الرَّزَّاقِ، قَالَ أَنْبَأَنَا مَعْمَرٌ، عَنْ قَتَادَةَ، عَنْ أَنَسٍ، قَالَ قَالَ رَسُولُ اللَّهِ ﷺ وَذَلِكَ عِنْدَ السُّحُورِ " يَا أَنَسُ إِنِّي أُرِيدُ الصِّيَامَ أَطْعِمْنِي شَيْئًا " . فَأَتَيْتُهُ بِتَمْرٍ وَإِنَاءٍ فِيهِ مَاءٌ وَذَلِكَ بَعْدَ مَا أَذَّنَ بِلاَلٌ فَقَالَ " يَا أَنَسُ انْظُرْ رَجُلاً يَأْكُلُ مَعِي " . فَدَعَوْتُ زَيْدَ بْنَ ثَابِتٍ فَجَاءَ فَقَالَ إِنِّي قَدْ شَرِبْتُ شَرْبَةَ سَوِيقٍ وَأَنَا أُرِيدُ الصِّيَامَ . فَقَالَ رَسُولُ اللَّهِ ﷺ " وَأَنَا أُرِيدُ الصِّيَامَ " . فَتَسَحَّرَ مَعَهُ ثُمَّ قَامَ فَصَلَّى رَكْعَتَيْنِ ثُمَّ خَرَجَ إِلَى الصَّلاَةِ .