Jami' al-Tirmidhi The Book on Salat (Prayer) Abdullah bin 'Umar bin Hafs bin 'Asim عبد الله بن عمر بن حفص بن عاصم al-Fadl bin Musa al-Synany الفضل بن موسى السيناني al-Husain bin Hryth الحسين بن حريث al-Qasim bin Ghnam al-Ansari القاسم بن غنام الأنصاري البياضي المدني “The Prophet was asked: ‘Which deed is the best?’ So he said: ‘Salat in the beginning of its time.'” https://parallelquran.com/hadith/jami-al-tirmidhi-170/