Sunan ad-Darimi 681
Muḥammad b. Yūsuf > Sufyān > Manṣūr And al-Aʿmash > Sālim b. Abū al-Jaʿd
From Thawban, the servant of the Messenger of Allah, may Allah bless him and grant him peace, who said that the Messenger of Allah, may Allah bless him and grant him peace, said: "Stay steadfast and you will not be able to count [the rewards] and know that the best of your deeds is prayer." Another narration states, "Indeed, prayer is among the best of your deeds." And another narration states, "No one will maintain their ablution except a believer." – Sound Chain
حَدَّثَنَا مُحَمَّدُ بْنُ يُوسُفَ حَدَّثَنَا سُفْيَانُ عَنْ مَنْصُورٍ وَالْأَعْمَشِ عَنْ سَالِمِ بْنِ أَبِي الْجَعْدِ
عَنْ ثَوْبَانَ مَوْلَى رَسُولِ اللَّهِ ﷺ قَالَ قَالَ رَسُولُ اللَّهِ ﷺ «اسْتَقِيمُوا وَلَنْ تُحْصُوا وَاعْلَمُوا أَنَّ خَيْرَ أَعْمَالِكُمُ الصَّلَاةُ» وَقَالَ الْآخَرُ «إِنَّ مِنْ خَيْرِ أَعْمَالِكُمُ الصَّلَاةَ» «وَلَنْ يُحَافِظَ عَلَى الْوُضُوءِ إِلَّا مُؤْمِنٌ» – إسناده صحيح