Muwatta Imam Malik Book of Purity, Hadith 37

Yahya related to me from Malik that he had heard that the Messenger of Allah ﷺ said, "Try to go straight, although you will not be able to do so. Act, and the best of your actions is the prayer. And only a mumin is constant in his wudu."

وَحَدَّثَنِي عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ " اسْتَقِيمُوا وَلَنْ تُحْصُوا وَاعْمَلُوا وَخَيْرُ أَعْمَالِكُمُ الصَّلاَةُ وَلاَ يُحَافِظُ عَلَى الْوُضُوءِ إِلاَّ مُؤْمِنٌ " .