Shifa bint Abdullah reported,
The Messenger of Allah ﷺ was asked about the best of deeds. He said, "Faith in Allah, striving in the path of Allah 
, and an accepted pilgrimage."
Ahmad 27094
Daifحدثنا هاشم بن القاسم قال حدثنا المسعودي عن عبد الملك بن عمير عن رجل من آل أبي حثمة
عن الشفاء بنت عبد الله وكانت امرأة من المهاجرات قالت
إن رسول الله ﷺ سئل عن أفضل الأعمال فقال إيمان بالله وجهاد في سبيل الله عز وجل وحج مبرور
Its chain of transmission is daif, because the narrator who reported from Shifa is unknown. However, the hadith is sahih, and it was narrated by Bukhari with similar wording, 1/77 no. 26, and Muslim, 1/72, both in the Book of Faith, and Tirmidhi, 4/185 no. 1658, in the Book of jihad, where he said it is hasan sahih, and Nasai, 5/113 no. 2624, in the Book of Hajj, and Darimi, 2/264 no. 2393, in the Book of jihad, and Abd bin Humayd, 460 no. 1591.