Riyad as-Salihin, Book 12, Hadith 1287 (In-Book) ⓘ
Abu Dharr (May Allah be pleased with him) reported: The Messenger of Allah was asked: "Which deed is the best?" He replied, "Faith in Allah and Jihad (fighting, struggle) in the Cause of Allah."[Al-Bukhari and Muslim].
وعن أبي ذر رضي الله عنه قال: قلت يا رسول الله أي العمل أفضل؟ قال: "الإيمان بالله والجهاد في سبيله" ((متفق عليه))