I asked Ayesha, "Which deed was most beloved to the Messenger of Allah ﷺ?"She replied, "The one done consistently."
قلت لعائشة أي العمل كان أحب إلى رسول الله ﷺ؟ فقالت: الدائم.
Bukhari narrated it in the Book of Tahajjud (1132), and Muslim in the Book of Prayer of the Traveler (741), both through the route of Abu Ahwas, from Ashath bin Salim, from his father, from Masruq, who related the hadith. See the chapter on the Prophet'sﷺ standing in prayer at different times of the night.