Muhammad ibn Al-Hasan said: “There is no contradiction between the two narrations because it is possible that the first narration is specific to the obligatory prayers, thus it is necessary to make an effort and make them up, and that the second narration is specific to the supererogatory prayers, for which it is permissible to abandon them. And if we were to apply both narrations to the supererogatory prayers, it would be possible to interpret the first narration as indicating recommendation and the second as indicating permissibility.”
Commentary #28