إِنَّ نُوحاً ع رَكِبَ السَّفِينَةَ- أَوَّلَ يَوْمٍ مِنْ رَجَبٍ فَأَمَرَ ع مَنْ مَعَهُ أَنْ يَصُومُوا ذَلِكَ الْيَوْمَ وَ قَالَ مَنْ صَامَ ذَلِكَ الْيَوْمَ تَبَاعَدَتْ عَنْهُ النَّارُ مَسِيرَةَ سَنَةٍ وَ مَنْ صَامَ سَبْعَةَ أَيَّامٍ أُغْلِقَتْ عَنْهُ أَبْوَابُ النِّيرَانِ السَّبْعَةُ وَ مَنْ صَامَ ثَمَانِيَةَ أَيَّامٍ فُتِحَتْ لَهُ أَبْوَابُ الْجِنَانِ الثَّمَانِيَةُ وَ مَنْ صَامَ خَمْسَةَ عَشَرَ يَوْماً أُعْطِيَ مَس
"Indeed, Noah (as) boarded the Ark on the first day of Rajab. He commanded those with him to fast on that day and said: 'Whoever fasts on that day, the Fire will be distanced from him by a journey of one year. Whoever fasts for seven days, the seven gates of Hell will be closed to him. Whoever fasts for eight days, the