[Fast a] prescribed number of days. But whoever of you is ill or on a journey, then ˹let them fast˺ an equal number of days [after Ramaḍan]. For those who can only fast with extreme difficulty, compensation can be made by feeding a needy person [for every day not fasted]. But whoever volunteers to give more, it is better for them. And to fast is better for you, if only you knew.
(Quran 2:184)