The Apostle of Allah ﷺ forbade them (his Companions) to observe Saum Wisal out of mercy for them. They said: You (Holy Prophet) yourself observe it. Upon this he said: I am not like you. My Lord feeds me and provides me drink.

نَهَاهُمُ النَّبِيُّ ﷺ عَنِ الْوِصَالِ رَحْمَةً لَهُمْ فَقَالُوا إِنَّكَ تُوَاصِلُ قَالَ إِنِّي لَسْتُ كَهَيْئَتِكُمْ إِنِّي يُطْعِمُنِي رَبِّي وَيَسْقِينِي