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Shiavault - a Vault of Shia Islamic Books Nahjul Balagha Part 1, The Sermons Sermon 199: Pledge yourself with prayer and remain steady on it… Containing advice given by Amir al-mu'minin to his companions ومن كلام له (عليه السلام) كان يوصي به أصحابه About Prayer Pledge yourself with prayer and remain steady on it; offer prayer as much as possible and seek nearness (of Allah) through it, because it is, (imposed***) upon the believers as*** (a) timed ordinance (Qur'an 4:103).
Have you not heard the reply of the people of Hell when they were asked: What hath brought you into the hell? They shall say: We were not of those who offered the regular prayers (to Allah) ! (Qur'an, 74:42-43). Certainly, prayer drops out sins like the dropping of leaves (of trees), and removes them as ropes are removed from the necks of cattle.
Allah, the Glorified, says: Men whom neither merchandise nor any sale diverteth from the remembrance of Allah and constancy in prayer and paying the poor-rate; ... (Qur'an. 24:37) Even after receiving assurance of Paradise, the Messenger of Allah - peace and blessing of Allah be upon him and his descendants - used to exert himself for prayers because of Allah, the Glorified's command. And enjoin prayer on thy followers, and adhere thou steadily unto it, ... (Qur'an, 20:132).
Then the Holy Prophet used to enjoin his followers to prayer and exert himself for it.