209. hadíth
وَ سَأَلَ عُبَيْدُ بْنُ زُرَارَةَ أَبَا عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ: عَنْ قَوْلِ اَللَّهِ عَزَّ وَ جَلَّ « فَمَنْ شَهِدَ مِنْكُمُ اَلشَّهْرَ فَلْيَصُمْهُ » قَالَ «مَا أَبْيَنَهَا مَنْ شَهِدَ فَلْيَصُمْهُ وَ مَنْ سَافَرَ فَلاَ يَصُمْهُ».
Ubayd ibn Zurara asked Abu Abdullah (a.s) about the verse of Allah (swt), the Exalted: "So whoever among you witnesses the month, let him fast it." (Surah Al-Baqarah 2:185) Imam (a.s) replied: "How clear it is! Whoever is present (not traveling) should fast it, and whoever is traveling should not fast it."