Man Lā Yaḥḍuruh al-Faqīh
Hadith 4041974 - 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».
Hadith.1974 - Ubayd ibn Zurara asked Abu Abdullah (as) 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 (as) replied: "How clear it is! Whoever is present (not traveling) should fast it, and whoever is traveling should not fast it."