Sure: AL‑BAQARAH 

Vers : 185

شَهۡرُ رَمَضَانَ ٱلَّذِيٓ أُنزِلَ فِيهِ ٱلۡقُرۡءَانُ هُدٗى لِّلنَّاسِ وَبَيِّنَٰتٖ مِّنَ ٱلۡهُدَىٰ وَٱلۡفُرۡقَانِۚ فَمَن شَهِدَ مِنكُمُ ٱلشَّهۡرَ فَلۡيَصُمۡهُۖ وَمَن كَانَ مَرِيضًا أَوۡ عَلَىٰ سَفَرٖ فَعِدَّةٞ مِّنۡ أَيَّامٍ أُخَرَۗ يُرِيدُ ٱللَّهُ بِكُمُ ٱلۡيُسۡرَ وَلَا يُرِيدُ بِكُمُ ٱلۡعُسۡرَ وَلِتُكۡمِلُواْ ٱلۡعِدَّةَ وَلِتُكَبِّرُواْ ٱللَّهَ عَلَىٰ مَا هَدَىٰكُمۡ وَلَعَلَّكُمۡ تَشۡكُرُونَ

The month of RamadhŒn [is that] in which was revealed the QurÕŒn, a guidance for the people and clear proofs of guidance and criterion. So whoever sights [the crescent of] the month,[1] let him fast it; and whoever is ill or on a journey then an equal number of other days. AllŒh intends for you ease and does not intend for you hardship and [wants] for you to complete the period and to glorify AllŒh for that [to] which He has guided you; and perhaps you will be grateful.


1- Also, "whoever is present during the month."