There is none from a Muslim fasting a day of Rajab and...
There is none from a Muslim fasting a day of Rajab and stands a night (for Salat) intending the Face of Allah -azwj the Exalted with that, except Allah -azwj will Write for him worship of a thousand years, fasting its days and stand its night!
وَ كَأَنَّمَا حَجَّ أَلْفَ حَجَّةٍ وَ اعْتَمَرَ أَلْفَ عُمْرَةٍ مِنْ مَالٍ حَلَالٍ وَ كَأَنَّمَا غَزَا أَلْفَ غَزْوَةٍ وَ أَعْتَقَ أَلْفَ رَقَبَةٍ مِنْ وُلْدِ إِسْمَاعِيلَ وَ كَأَنَّمَا تَصَدَّقَ بِأَلْفِ دِينَارٍ وَ كَأَنَّمَا اشْتَرَى أُسَارَى أُمَّتِي فَأَعْتَقَهُمْ لِوَجْهِ اللَّهِ وَ كَأَنَّمَا أَشْبَعَ أَلْفَ جَائِعٍ وَ آمَنَهُ اللَّهُ مِنْ عَذَابِ الْقَبْرِ وَ هَوْلِ مُنْكَرٍ وَ نَكِيرٍ And it would be as if he has performed a thousand Hajj, and performed a thousand Umrah from Permissible wealth; and it would be as if he has battled in a thousand military expeditions, and liberated a thousand necks from the sons of Ismail -as ; and it would be as if he has donated a thousand Dinars in charity; and it would be as if he had bought captives of my -saww community and freed them for the Face of Allah -azwj , and it would be as if he had satiated a thousand hungry ones, and Allah -azwj will Secure him from punishment of the grave and horrors of Munkar and Nakeer’.
This is the Reward, all of it for the one fasts one day, or stands a night (for Salat), from a month of Rajah?’ فَقَالَ رَسُولُ اللَّهِ ص هَذَا لِمَنْ لَا يُنْكِرُ قُدْرَةَ اللَّهِ عَزَّ وَ جَلَّ Rasool-Allah -saww said: ‘This is for one who does not deny the Power of Allah -azwj Mighty and Majestic!’ ثُمَّ قِيلَ يَا رَسُولَ اللَّهِ ثَوَابُ رَجَبٍ أَبْلَغُ أَمْ ثَوَابُ شَهْرِ رَمَضَانَ Then it was said: ‘O Rasool-Allah -saww !
Rewards of a month are more extensive or Rewards of a month of Ramazan?’ فَقَالَ رَسُولُ اللَّهِ ص لَيْسَ عَلَى ثَوَابِ رَمَضَانَ قِيَاسٌ وَ لَكِنْ شَهْرُ رَجَبٍ شَهْرٌ عَظِيمٌ Rasool-Allah -saww said: ‘There is no comparison to Rewards of a month of Ramazan, but a month of Rajab is a mighty month’.