Rulings regarding People who Perform Worshipping Activities only on Ramadan
It is too bad that some people, on Ramadan, continuously perform the five compulsory prayers, the night prayer, and Qur’an recitation; but after it has passed, they will leave all or half of the righteous activities that they used to do. What is the ruling regarding their deeds? Are their righteous deeds performed on Ramadan accepted? What is your advice to such people?
Performing the righteous deeds on the month of Ramadan with vengeance is indeed a good thing, because Ramadan possesses some excellences and it is a grand time for the muslims. And a Muslim is required to be serious in performing good deeds throughout his age, during his life, in every month of it. Because age is a truly precious chance, whereas men will surely come to a place where they will desperately need the righteous deeds. That is because the reward on the Hereafter depends on the deed.
Thus, a muslim is required to use his lifetime in the world to perform righteous deeds and and spend his days and his whole time in goodness and virtues. As with Ramadan, he is required to make best of it with extra efforts.
Whereas people who underestimate the compulsory prayers, who, when the Ramadan came, perform the compulsory prayers and maintain it with vengeance, but when Ramadan has passed, they once again left the compulsory prayers and underestimated it, their prayers on Ramadan would not be accepted.
It was said to some scholar of predecessors, “There are some people who worship very seriously on the month of Ramadan, but if the Ramadan has passed, they would leave the deeds.”
They commented, “(They are) the worst of men, since they recognize Allah only on Ramadan.”
The deeds of these people would not be accepted, if they abandon the compulsory prayers. Whereas if they only left the voluntary prayers, then they are not considered guilty and it is expected that their righteous deeds in Ramadan will be accepted. And Allah know best.
Reference: “Al Muntaqa min Fatawa Syaikh Shalih Al Fauzan, 3/158-159”