Riyad as-Salihin #619

Abu Hurairah (May Allah be pleased with him) reported: The Messenger of Allah (ﷺ) was asked: "What other good deed could be an equivalent of Jihad in the way of Allah?" He (ﷺ) replied, "You do not have the strength to do it." (The narrator said:) The question was repeated twice or thrice, but every time he (ﷺ) answered, "You do not have the strength to do it." Then he (ﷺ) said, "One who goes out for Jihad in the Cause of Allah is like a person who observes Saum (fasting), stands in Salat (prayer) constantly, recites the Ayat of the Qur'an and does not exhibit any lassitude in fasting and prayer until the participant of Jihad in the way of Allah returns.".