Prayer, Zakat, and fulfillment of obligations
Nahj al-Balāgha|Volume 1|Book 1|Chapter 199
وَإِنَّهَا لَتَحُتُّ الذُّنُوبَ حَتَّ الْوَرَقِ، وَتُطْلِقُهَا إِطْلاَقَ الرِّبَق، وَشَبَّهَهَا رَسُولُ اللهِ (صلى الله عليه وآله) بِالْحَمَّة تَكُونُ عَلَى بَابِ الرَّجُلِ، فَهُوَ يَغْتَسِلُ مِنْهَا فِي الْيَوْمِ وَاللَّيْلَةِ خَمْسَ مَرّات، فَمَا عَسَى أَنْ يَبْقَى عَلَيْهِ مِنَ الدَّرَنِ؟
Certainly, prayer drops out sins like the dropping of leaves (of trees), and removes them as ropes are removed from the necks of cattle. The Messenger of Allāh - the peace and blessing of Allāh be upon him and his descendants - likened it to a hot bath situated at the door of a person who bathes in it five times a day. Will then any dirt remain on him?