In 3 volumes, «the well-known science in the benefits of the virtues of days and months», a work of the notable Hadith scholar born in Valencia, Ibn Dihya al-Kalbi al-Sabti (d. 633/1236, also known as Abu al-Khattab). The work contains reminders, guidance, and explains the virtues of days and months, and the reward for those who worship in them. Many scholars have mentioned it and the benefits gained from it.