"The book of Salah" (كتاب الصلاة) is an audio application It is an explanation of Book of Salaah from Umdat Al-Ahkaam.
In these series, Dr. Saleh As-Saleh explains some hadiths from Umdat Al-Ahkam. He shows timings of Salaah, prohibited times to pray and how a muslim can make up the prayer if s/he misses it. He also explains the rulings of imamah, adhaan and iqaamah, facing the qiblah, congregational prayer and rows in prayer. He also illustrates the optional prayers.