2:185
Month (of) Ramadhaan (is) that was revealed therein the Quran, a Guidance for mankind and clear proofs of [the] Guidance and the Criterion. So whoever witnesses among you the month, then he should fast in it, and whoever is sick or on a journey then prescribed number (should from days other. Intends Allah for you [the] ease and not intends for you [the] hardship, so that you complete the prescribed period and that you magnify Allah for [what] He guided you so that you may (be) grateful.