A man from the Companions of the Prophet ﷺ told me that the Messenger of Allah ﷺ prohibited cupping and perpetual fasting, but he had not made them unlawful showing mercy on his Companions. Thereupon he was asked: Messenger of Allah, you observe perpetual fast till dawn. He replied: I observe perpetual fast till dawn (for) my Lord gives me food and drink.
حَدَّثَنِي رَجُلٌ مِنْ أَصْحَابِ النَّبِيِّ ﷺ أَنَّ رَسُولَ اللَّهِ ﷺ نَهَى عَنِ الْحِجَامَةِ وَالْمُوَاصَلَةِ وَلَمْ يُحَرِّمْهُمَا إِبْقَاءً عَلَى أَصْحَابِهِ فَقِيلَ لَهُ يَا رَسُولَ اللَّهِ إِنَّكَ تُوَاصِلُ إِلَى السَّحَرِ فَقَالَ إِنِّي أُوَاصِلُ إِلَى السَّحَرِ وَرَبِّي يُطْعِمُنِي وَيَسْقِينِي