Umm al-Muminin Umm Salamah (RA) narrated: “The most beloved deed to the Messenger of Allah (PBUH) was the deed that was performed consistently, even if it was little.”
Reference: Al-Ruasi, Waki ibn al-Jarrah, Al-Zuhd, p. 498, Maktabat al-Dar, Madinah al-Munawwarah, 1404 AH.